7100 questions

[imactheknife]

Have a 7100 logic board. It turns on, chimes, gets mous cursor, and floppy image. Wont boot from any hard drive, or floppy. Trys floppy then reverts back flashing question mark. Scsi lights come on, but nothing. Tried internal and external

 

[3lectr1cPPC]

has it been recapped? These are at the point now where they're unreliable if they haven't been.

 

[imactheknife]

has it been recapped? These are at the point now where they're unreliable if they haven't been.

Yeah thats the next step. Will try and report back!

 

[trag]

Also, if you have not already, remove the heat sink, clean the chalk that was once heat sink grease, and replace with a tiny dab of good heat sink compound. Do not crack the CPU in the process.

 

[imactheknife]

Also, if you have not already, remove the heat sink, clean the chalk that was once heat sink grease, and replace with a tiny dab of good heat sink compound. Do not crack the CPU in the process.

I repasted the cpu, recapped board. Will boot from floppy, but doesnt seem to like any scsi devices i use with it. Weird. Think maybe the psu is not powerful enough? Not recapped and someone hobbled this thing into a iicx case

 

[joshc]

I had a 7100 which did a similar thing, think it maybe had a stuck bus. These boards can be problematic. There’s a reason I don’t get involved with NuBus Power Macs anymore.

 

[slomacuser]

What size are the scsi disks and what system software do you use? The drives must be smaller than 2 GB when using system 7.5.x

 

[imactheknife]

What size are the scsi disks and what system software do you use? The drives must be smaller than 2 GB when using system 7.5.x

She wont boot from cdrom, or blue scsi. So assuming stuck bus or something else. Nice to have a dead 7100 and 8100… at least 6100 works well lol

 

[trag]

We've also seen a few users where the SCSI connector (DB25) is just so old that it's dirty/oxidized. A good contact cleaner spraying might be a good idea. Maybe DeOxit?

 

[imactheknife]

We've also seen a few users where the SCSI connector (DB25) is just so old that it's dirty/oxidized. A good contact cleaner spraying might be a good idea. Maybe DeOxit?

Will look into that too.

 

[3lectr1cPPC]

Check for term power? What does SCSI Probe show?

 

[imactheknife]

Well, found a proper floppy and she boots from that. Wont find scsi. So either scsi chip is dead if it has a dedicated one, or something else. Too bad, works normal off floppy