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| 7100 questions |
Posted by: imactheknife on 2024-02-01 07:19:50
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 |
Posted by: 3lectr1cPPC on 2024-02-01 07:32:35
has it been recapped? These are at the point now where they're unreliable if they haven't been. |
Posted by: imactheknife on 2024-02-01 07:48:44
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! |
Posted by: trag on 2024-02-02 12:49:40
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. |
Posted by: imactheknife on 2024-02-02 16:01:36
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 |
Posted by: joshc on 2024-02-03 00:52:34
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. |
Posted by: slomacuser on 2024-02-03 06:09:14
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 |
Posted by: imactheknife on 2024-02-04 05:47:47
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 |
Posted by: trag on 2024-02-05 16:42:16
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? |
Posted by: imactheknife on 2024-02-06 05:41:35
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. |
Posted by: 3lectr1cPPC on 2024-02-06 06:54:01
Check for term power? What does SCSI Probe show? |
Posted by: imactheknife on 2024-03-24 18:46:15
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 |
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