I'm trying to restore a Quadra 840av and am having SCSI issues. My fear is that the SCSI controller on the motherboard is fried and this computer cannot recognize any SCSI devices hooked to it internally or externally.
Here's the situation:
On power up, it chimes but the screen remains dark for almost 30 seconds (is that length normal?) and then it shows a grey screen with the cursor and the flashing "?" floppy icon. The cursor can be moved around with the mouse on that screen. So I am concluding that the Quadra has passed its initial diagnostics and now cannot find a System. Is that a reasonable conclusion?
The computer came with 2x internal HDs: a Seagate ST1100N 1GB and a Quantum Lightning ProDrive 730 MB. I have confirmed that both work when hooked up to a PowerMac G3. But when hooked up either internally or externally to the Quadra they spin up but are not recognized.
I am able to boot with an "Install Disk 1" floppy that I made from the "Install Me First" System 7.1 Installer CD that came with the Quadra. The computer gives me a happy Mac, and then the installer software starts and I can navigate the first screens and click onscreen buttons, etc. However, since the Quadra fails to recognize a hard drive, I cannot proceed with installation and can only choose Cancel followed by Restart or Shutdown.
So the good: The Quadra can boot from floppy and the installer software seems to run fine suggesting the CPU, input/output and RAM are OK.
The bad: no combination of internal or external hard drives are recognized by the Quadra, and it seems like the internal CD-ROM is also ignored (when I try to boot from a System 7.6 Installer CD the Quadra still gives me a flashing "?" disk symbol).
I know SCSI is voodoo, so I've tried different combinations of SCSI ID numbers, termination on/off, termination power on/off on the two HDs, a different SCSI cable, hooking up internally vs externally and the computer still fails to see these HDs.
Is there something I just don't understand about the 840av SCSI? I've read the 660/840av models are particularly touchy when it comes to SCSI setup...?
Any advice would be GREATLY appreciated!