Reference the following configuration:
- Power Macintosh 8100/80 with CD-ROM and 500 megabyte HD
- Apple 16" Color Display attached to the HPV card
- Ehman Video Card and monochrome display
- MicroTek Scanner (ID 6)
- APS Syquest (ID 2)
- Bernoulli (ID 4)
The computer would not produce video on the monitor attached to the HPV card if any one of the external SCSI devices were powered on before starting the computer. The display attached to the Ehman card would work fine. The same SCSI chain worked fine on another Power Macintosh 8100.
To troubleshoot:
- Check SCSI ID's, cable lengths, and termination
- Reset the PRAM
- Boot from the Power Macintosh System Software CD
- If the issue persists, try reseating the HPV card.
Note: Reseating the HPV card on a Power Macintosh should only be performed by an Apple Authorized Service Provider as damage to the computer's logic board can result if not done properly.