G3 Beige tower 266 (1998!) start up problems

G3 Beige tower 266 running OS9.2. Mitsubishi Diamond Pro 91TXM monitor. External SCSi equipment daisy chained Lacie CD writer, Iomega Zip, Umax A4 Mirage 2 scanner. keyboard connected to USB


I am moving studio so no longer have space for a string of SCSi equipment I don’t use anymore and have offered my G3, the huge heavy monitor, Apple extended keyboard, an external Zip drive and LaCie CD recorder to Freecycle. I have a taker but I need to clean the hard drive securely before giving it away.

The G3 was connected via SCSi to a Data Transfer Switch so for years I could scan into the G3 then quickly move images onto my G4 on the network. Then I upgraded to a MacBook Pro laptop and hardly use this set up, so the G3 has probably not been on for 4 years or possibly more.

I have tried all options with the set up, having removed SCSi equipment to give away I replaced it again, realising I’d broken the SCSi chain which may have caused start up problems. Also zapped the PRAM and started without extensions. Tried booting off 9.2.1 disc, opened Utilities and it can’t find a HD to fix.

Now I am looking at the G3 with all SCSi equipment unplugged, connected via SCSi to the monitor.

It immediately opened OS9.2 started showing icons for sound, a ? in one I don’t recall but might be the HD? A few more icons started to appear for a second or two then it stuck at a blank grey screen and the cursor is unresponsive. Restarted via Ctrol Command Power, small smiley icon in middle of grey desktop. Now getting the message

-“This start up disk will not work on this Macintosh model. Use the latest installer to update this disk for this model-“

I have tried booting from OSX Tiger and the 9.2 but no good. It opens the Utilities from the CD but Drive Setup can not find a drive


I wanted to check my files before erasing the HD but can’t access the HD. Any suggestions?

Or should I just remove the HD ( how?) and give the G3 without it?


thanks for any advice- I am not a Mac whizz, just remembering how hands on I used to be 20 years ago and quite enjoying the challenge!





Posted on Nov 27, 2022 6:18 AM

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Posted on Nov 27, 2022 11:05 AM

Were you connecting the SCSI peripherals to the onboard SCSI-1 bus via the motherboard's DB-25 port on the back of the computer or to a SCSI controller PCI card? How about the hard drive? Was it upgraded from the stock 6 GB IDE drive to a larger capacity drive or did the computer come with the optional 9 GB Ultra Wide SCSI drive? I ask because an IDE drive can be removed from the computer and easily connected with an adapter (about $15-$20 at any PC store) to another Mac's USB port. A SCSI hard drive is a different matter, given the conversion needed for connection to a different type bus. If the G3 has been sitting around unused for several years or more, the motherboard's PRAM battery is dead. It's a 3.6-volt, 1/2AA lithium battery like this. A very weak or dead battery can cause startup issues, so it was always the 1st thing to replace when troubleshooting.

If you'd like to remove the hard drive from the computer and be able to donate the clutter of everything else, remove the side panel and you'll see the primary HDD located in a carrier, mounted upside down above the power supply. Remove the 2 screws that secure the carrier and pull it out toward you. It may be easier to do if you remove the power and date cables first, otherwise, carefully pull it out far enough to disconnect them. Remove the machine screws that attach the hard drive to the carrier than reinstall the empty carrier in the computer. The new owner can install a replacement hard drive and you won't have the concerns about personal files being accessed. If it's an IDE drive, connecting an adapter (as shown in the link) to the bare drive to retrieve data won't be a problem. Handle the drive by its sides, so you don't risk damaging the circuit board on the underside from static discharge. If it's a 68-pin Ultra-SCSI drive, then leaving it installed and getting the G3 to start will be the safest way to check for files that you may want.

You indicated zapping the PRAM, but how many times did you let it reboot to the startup tone each time? Three times is recommended before releasing the keys, but you wrote that you're using a USB keyboard, which means that it's connected to a USB PCI card. Because there is no native USB support in a beige G3's firmware, support is driver-based via extensions. The keyboard is only recognized after the computer has successfully booted and loaded the necessary USB extensions. Booting with Extensions Off renders the USB-connected keyboard inactive. Having the original ADB keyboard makes troubleshooting easier.

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Question marked as Top-ranking reply

Nov 27, 2022 11:05 AM in response to LizHartist

Were you connecting the SCSI peripherals to the onboard SCSI-1 bus via the motherboard's DB-25 port on the back of the computer or to a SCSI controller PCI card? How about the hard drive? Was it upgraded from the stock 6 GB IDE drive to a larger capacity drive or did the computer come with the optional 9 GB Ultra Wide SCSI drive? I ask because an IDE drive can be removed from the computer and easily connected with an adapter (about $15-$20 at any PC store) to another Mac's USB port. A SCSI hard drive is a different matter, given the conversion needed for connection to a different type bus. If the G3 has been sitting around unused for several years or more, the motherboard's PRAM battery is dead. It's a 3.6-volt, 1/2AA lithium battery like this. A very weak or dead battery can cause startup issues, so it was always the 1st thing to replace when troubleshooting.

If you'd like to remove the hard drive from the computer and be able to donate the clutter of everything else, remove the side panel and you'll see the primary HDD located in a carrier, mounted upside down above the power supply. Remove the 2 screws that secure the carrier and pull it out toward you. It may be easier to do if you remove the power and date cables first, otherwise, carefully pull it out far enough to disconnect them. Remove the machine screws that attach the hard drive to the carrier than reinstall the empty carrier in the computer. The new owner can install a replacement hard drive and you won't have the concerns about personal files being accessed. If it's an IDE drive, connecting an adapter (as shown in the link) to the bare drive to retrieve data won't be a problem. Handle the drive by its sides, so you don't risk damaging the circuit board on the underside from static discharge. If it's a 68-pin Ultra-SCSI drive, then leaving it installed and getting the G3 to start will be the safest way to check for files that you may want.

You indicated zapping the PRAM, but how many times did you let it reboot to the startup tone each time? Three times is recommended before releasing the keys, but you wrote that you're using a USB keyboard, which means that it's connected to a USB PCI card. Because there is no native USB support in a beige G3's firmware, support is driver-based via extensions. The keyboard is only recognized after the computer has successfully booted and loaded the necessary USB extensions. Booting with Extensions Off renders the USB-connected keyboard inactive. Having the original ADB keyboard makes troubleshooting easier.

Nov 29, 2022 10:08 AM in response to LizHartist

Assuming that somebody will end up with the G3 and use it, the fastest solution for you is to remove the hard drive from the computer, as I described before. Then you won't have to go through the initializing/secure wipe process or have concerns about any of your files being accessed in the future with data recovery software. Once removed and with an assortment of the correct screwdriver tips, you can open up the hard drive and examine its internal construction (if interested). Otherwise, it's a good paperweight.

If you prefer to leave the drive installed, you'll need to boot the G3 from a compatible installer disk. You mentioned having an OS 9.2.1 CD, so if it's a universal installer disk, it will be white with a large, orange-colored "9" on it. If you have a gray restore disk designed for another model Mac, it likely won't boot the G3. Because you're using a USB keyboard, you need an alternate method to restart from the optical drive than holding down the "C" key. The moment the computer begins to restart, the USB keyboard isn't recognized (as mentioned in my earlier post), so holding down any combination of keys is pointless. As a workaround, after you insert the installer disk in the drive and it mounts on the desktop, use the "Startup Disk" control panel and select the CD to boot the G3 and then restart the computer. If it restarts from the installer disk, you can continue to securely erase the internal hard drive. In the Utilities folder, look for "Drive Setup." When you launch Drive Setup, all connected hard drives will be listed. Click on the internal drive and choose to initialize it. The menu bar has a "Functions" drop-down menu from which you'll select "Initialization Options." You'll be presented with a "zero all data" option, which you'll select. After you click "Initialize," you'll get the usual warning that all data will be lost, etc. Proceed and the reformatting with a secure wipe will begin. If it's the original (small capacity) hard drive, the process shouldn't take very long. If the original drive has been replaced with a greater capacity drive, it will take longer (hours). If that's the case, I'd suggest starting this early in the work day, so you'll be there to see it complete the process or fail, if problems are encountered because of surface damage on the platter. After it has successfully reformatted the drive, you'll see a message indicating that the "Initialization was successful."

Nov 28, 2022 6:29 PM in response to LizHartist

Another startup problem we fought in the Beige G3 days was a loose "personality" card. The p-card is the one with audio and sometimes video-out ports. The card is secured at only one end and, with transport and storage, the card to start to "walk up" from the unsecured end.


Rather that simply reseat, remove the card and clean it contacts and blow any invaders from the card slot.

Nov 28, 2022 11:20 PM in response to Allan Jones

I got it going again, after I thought the vacuuming I did had shorted something then reseated the ram & all the connections. By rebooting in recovery mode ( command-r) and ran the built in disk utilities which I was surprised to see say the disk is ok. I’ve been able to see what’s on the drive and now am wondering how to securely wipe the drive as unlike another ancient Mac I am also wondering whether to dispose of, the G4 Powermac, it doesn’t offer secure waste disposal. Would initialising the disc using the G3 built in option securely overwrite my information?

Dec 6, 2022 8:32 AM in response to Jeff

Apologies for taking so long to reply. I’ve only had limited time and have managed to get both old G3 and G4 Macs going separately but not via the previous network, so I’ve abandoned just one high res scan I can’t remove off the G3 and now removed the hard drive. Its actually dated 1997 and is 4GB, Japanese made by Viking with Apple logo on it- this G3 was my first Mac! I think its a SCSi drive and we had difficulty getting the 4 pin connector out on left- see photo, I don’t know its name, but I’m giving the G3 away on Freecycle ( in the UK) so now its secure. Thanks very much for your help. Its old but a great machine, still works after 25 yrs!


I have questions about how to connect my graphite Powermac G4 to a monitor now as I’m giving away the heavy SCSi connected Mitsubishi monitor with the G3. I have tried without success to connect the G4 to my mid 2012 MacBook Pro laptop just so I can see it on the screen. I think I need a FireWire 800 male to FireWire 400 female adapter.. I’m going to buy a new Mac in 2023, but still want to use Photoshop and Illustrator etc, which I own rather than rent, which were made obsolete a few years ago. Hence keeping the 2012 MacBook Pro. I’ll start it in a new topic so others can find it

Nov 27, 2022 1:23 PM in response to LizHartist

I should have been more clear about the use of a USB keyboard for the purpose of zapping the PRAM in a beige G3. PRAM clearing occurs as soon as the computer reboots and you hear the startup tone, before the extensions have loaded. Because its design pre-dated USB native support, a beige G3 doesn't recognize a USB PCI card — or anything connected to it — until the USB driver extensions for it have loaded, well into the startup sequence. As a result, holding down the "Command + Option + P + R" keys on a USB keyboard isn't recognized by the computer and you're unable to zap the PRAM. The original ADB keyboard is the only way to accomplish the task. Be careful with a vacuum cleaner's plastic attachment inside the computer, because the plastic acquires a static charge that could possibly damage a component on the motherboard. I'm glad that you found somebody who's interested in taking the computer. They were built well and are so heavy, that selling them in the U.S. incurs so much shipping charge as to make a sale a bit impractical, unless it's picked up locally.

Nov 27, 2022 11:44 AM in response to Jeff

Hi Jeff brilliantly informative answer thanks, I did not let the chimes go 3 times when zapping the PRAM so will if I try that again. I’m in UK so now going to be a time lapse as I’m home & I left the Mac at my studio but after posting I waited several hours for replies then decided to look inside it to remove the HD.

I started it up with no SCSi peripherals plugged in and opened it while it was booting up and when I glanced at the monitor, I was amazed to see it had started and finally ( after several days of failed attempts) opened and the HD was there on the desktop! Stupidly perhaps, instead of first opening that, I tried to open a Word doc that was left on the desktop. The G3 started opening Word, froze and eventually I forced a restart. Since then it has refused to find the start up disk again so I have vacuumed the dust out from inside and now its not even powering up. No power at all in the G3 but the monitor comes on.

I’ve left it connected to power to see if tomorrow it will work, incase the hour or two when I left it while waiting for any response to this question, was what gave it energy to start? Or maybe it was me opening the side that disturbed something that had been loose ( or moved some dust!)


Nov 28, 2022 10:06 AM in response to Jeff

Hi Jeff, the G3 has started after being left plugged in for 24hrs and I discovered the keyboard cable had been disconnected too which doesn’t help! Its opened Os 9.2 but the desktop hasn’t loaded fully ( although shows smiley Mac face’s background ) although the mouse is responsive its just a blank screen full of the Smiley face Macs pattern

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G3 Beige tower 266 (1998!) start up problems

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