SCSI Booting Problems

I have a B&W Mac with an G4 400MHz upgrade in it.

I just got an Adaptec 2940UW SCSI card and a 9.1GB drive to replace the original Apple IDE drive. The install of 9.2 went fine, but I cannot boot from the SCSI drive. I can still boot from the CD and I'm pretty sure I could replace the IDE drive and it would boot from that too.

I have found one way to get the computer to start up. I put in the CD and wait until the flashing question mark turns into a happy mac and then press the eject button on the cd drive. The CD comes out, the computer returns to a flashing question mark for a bit but then goes to the SCSI drive, boots and works fine.

The following diagnostic steps have been tried:
Letting the computer sit for a 1/2 an hour with a flashing question mark (nothing changed)
Installing 9.2 onto another SCSI drive that I know has correct jumper settings to boot from (so I'm pretty sure it's something with the card)
Re-flashing the card with 4.1 firmware from Adaptec
Zapping PRAM

Any ideas?

eMac Mac OS X (10.4.5) HP LaserJet 4000TN & HP Color LaserJet 4500N

Posted on May 20, 2006 3:57 PM

18 replies

Noah Robbin Author

Level 3

700 points

Jun 25, 2006 6:23 AM in response to Mauro Maitan1

I followed the instructions at the xlr8yourmac website and now have a card that works perfectly in my mac.

-Noah

Jun 25, 2006 10:49 AM in response to Noah Robbin

Noah-

Can you post a link to the exact article that helped you, or its title?

Thanks a lot!

Noah Robbin Author

Level 3

700 points

Jun 26, 2006 7:47 PM in response to Grant Bennet-Alder

http://www.xlr8yourmac.com/tips/adaptecConvert.html

I found it hard to find the exact flash memory chip used by Adaptec. I ended up buying AT29C010A-70JC which is the same chip but with a faster access time.

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SCSI Booting Problems