On that PMU reset page there are 4 pictures of PowerMac reset buttons.
Which one is mine? It's a PowerMac 1.25 DP FW800 model M8840LL/A with "a 4X AGP ATI Radeon 9000 Pro graphics card with 64 MB of DDR SDRAM". So the AGP edition?
•Digital Audio edition
•Gigabit ethernet edition
Check this site for battery part numbers and sources. https://sites.google.com/site/macpram/mac-pram-nvram-cuda-pmu-battery-tutorial Mac PRAM, NVRAM, CUDA/PMU & Battery Tutorial
Something else to try. Resetting the Logic Board
Resetting the logic board can resolve many system problems. Whenever you have a
unit that fails to power up, you should follow this procedure
before replacing any modules.
1 Unplug the computer.
2 Press the Power On button on the front of the unit.
3 Open the side access panel.
4 Remove the battery from the logic board.
5 Wait at least 10 minutes before replacing the battery.
6 Make sure the battery is installed in the correct +/-
7 Reassemble the computer and test the unit.
This procedure resets the computer’s PRAM. Be sure to
check the computer’s time/date and other system parameter settings
Your PMU button is by the ATA connectors:
It is quite possible that the power failure surged and blew a fuse inside the power supply.
That requires opening the power supply to replace.
It may be also that some internal componenet is burned and replacing the fuse will result in another blown fuse.
Anyhow, working inside a PSU can be dangerous due to stored electricity in the capacitors so be careful with tools and fingers inside a PSU.
Discharge of stored charge prior to opening is recommended.
The PSU can be tested (without disassembly) using a voltmeter and these instructions:"
Thanks SO much for that info about a month ago to help get my friend's G4 PowerMac FW800 powered up again. We tried the PMU reset, replacing the PRAM battery and resetting the logic board but none of that worked.
He doesn't want to spend $100+ to have it diagnosed at our local Authorized Apple Warranty Repair Center and is ready to just dump it but needs the 1000s of photos off the hard drive. How can we get those files off a hard drive where the computer doesn't power up? Thanks!
Assuming the drive works, just buy an external enclosure for it (make sure it has the connectors you need for the machine you will plug it into). Then just access it like any external drive over USB, Firewire or whatever your enclosure and computer support.
Just remember for that Mac, you need an enclosure for an Ultra/ATA-100 drive (that is an IDE drive, not a SATA drive)
Honestly, it will be FAR cheaper to just buy a 3.5" IDE/ATA external enclosure, remove the drive, put it in the enclosure and use it that way. Even a top of the line enclosure will be no more than about $50, a cheap one likely under $20 - any place like Apple is going to charge your for their people's time, which will add up to far more.
You can find enclosures at www.macsales.com, tigerdirect, newegg, amazon... It is not hard to remove the drive and put it in the enclosure.
Alternatively, if you have access to another Mac with an empty drive bay (and the Mac is an onlder one, with an IDE interface so an older G4 Mac) you could put the drive in that machine and access it that way.
Its your choice - you can always call a few places and get some estimates to do it all for you (just be sure to tell them this is a Mac with an older IDE/ATA drive so they will know they can handle the odler drive interface AND the fact it will he an HFS+ formatted drive - so a windows-only shop will be useless to you). If you have an reliable computer shop nearby that knows about Apple machines, you could also ask them about actually just removing the drive and installing it in an enclosure for you - you would actually take care of copying the files and such, but just get them to help pull the drive and set it up in a suitable enclosure for you to use as an external drive (heck, offer them the G4 for parts in exchange for the service, if they sell or repair older Mac's?).