I hope listers aren't worn out from this thread, caused by my 8500, but I have to get these things right, or I may repeat some bad habits. *To clear a few cobwebs, I've inserted my *questions/comments.*
> Bruce Johnson wrote: > > On May 4, 2005, at 3:59 PM, David Elmo wrote: > > >> From: Jim Kilponen <[EMAIL PROTECTED]> > >> Subject: [PCI] No start-up, no Icon on my PM8500 (?) > >> During those bad days I just got a startup chime, a gray screen and a live cursor. I didn't have a clue what to check, so I joined this list and received really fine help from so many responders. I appreciate it all. > > > > > I would yank out all the ram except one or two trusted sticks (you > > don't need to trust even, you can rotate in trials. See if any single > > sticks will do the job, start on a basic system ext set or all off if > > possible. Take all prefs out of SF for a while and press Cuda or yank > > battery for a while and reinsert... > > *Can sev. non-matched prs. of DIMMs or VRAM cause slowdown/dmg? > > This is less likely, imo, to be memory or a PRAM issue than a SCSI > termination or ID thing. > > This gray screen + cursor is *exactly* what you get with a fubared > SCSI chain. > > Double check that all drives are id'ed correctly, and distinctly. > > Make sure you have termination at only one device on the bus, > preferably the last phsyical device, but I've seen situations where, > depending on cable lengths and the particular devices, termination > elsewhere in the chain worked better. > > Make sure that only ONE device is providing termination power to the > chain (typically in a stock set up this is the Apple-installed CDROM.) > *I checked two other CD drives and saw termination jumpers on them. That seems to fly against what has been discussed, however, I re-read Glen's post, that Apple CDD's have no termin.jumper, only Term.Power, and whether it is On or Off is okay. I saw HD pin prs. TE and TP; termin. -enabled, and termination-power. Can someone explain the differences? Some HD's are terminated w/resistor packs, parallel w/SCSI connector (no jumer pins.. oh boy); watch for such when using two devices in the same chain, to avoid double termination. At least, that is what I think. (Adrian's quandary might be lessened with Glen's info above) >- But I stand corrected on the termination issue. I have long thought >- that the CD ROM at ID=3 is terminated at the factory . This does not >- seem to be the case. When I have time I will go through my saved PCI >- list posts and find out where i got this idea. As it seemed like >- gospel that was often repeated. >- And the rare occasions on which I did have by accident an ID beyond 3 >- the startup and operation did indeed give problems. The last point 'may apply' to internal devices, but I've not seen it happen. Apple may've used different CD/ID# on diff. models. And then the Parity- enabled on all my CD drives (maybe either On or Off applies to that too). > *I've been careless about terminations; that may have been a cause of my 8500 to end up w/corrupted finder & file structures on IBM HDD. By following the advice of many, i.e., zapping PRAM, resetting CUDA button (especially when making cpu changes, and maybe other hdwe.), I was able to mount HDD w/TechTool, long enough to test & learn of the corruption. A different HDD has been running fine after a few conflicting extensions were disabled. Luckily, my fears of a bad mobo went away. :o) > (snip) > > Finally, if you have one of those wretched SCSI/Parallel Zip drives, > take it out and throw it against the wall repeatedly until it can > commit evil no more... > *My goodness... now that is what I would call real Termination Power. I hope Iomega ZIP100 isn't in the above class; that wld. mess up my walls. When using it with the problematic IBM HD, it often refused to eject or to even mount without Disk1st Aid, and the same with internal floppy drive. Diff. HDD seems to cure the problems; Finder/file dmg. maybe caused it. I'm still on a 6100/G3/240MHz Sonnet; it has the [PCI] posts. The cpu temperature was 130�, compared to my 8500's operating temp. of 100�. I don't know what is too high for cpu's; one spec. sheet said 50�C is tops, so I ripped a 286 peecee fan and mounted it under the case intake venting. I patched into 12v. of CD-ROM plug. Noisy, but now stays @114�/46�C. Flatpac Macs are so darn e-z to access. Do 8500 mobo's fit into 7300's? I like the 8500's roominess but it's a helluvahassle to get to that mobo- unplugging and re-plugging; but I don't mind, now that the 8500 is alive! Am wiser/aware of int.+ ext. chains & termination. Sorry for a long post. Thanks for the help, tips, links and info. I will save them all to re-read. YooperJim Kilponen � * my 4pg. website <geocities.com/jimkilpy> -- PCI-PowerMacs is sponsored by <http://lowendmac.com/> and... 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