I don't have a UP2000, but I had a 164sx that behaved very much like what you
describe. I looked at SCSI problems for a day or so, changing terminators, cables,
disks, controllers. You name it, I changed it. I finally replaced the SDRAM DIMMS
and everything worked again. I was completely looking in the wrong place because
the SCSI subsystem was indicating the error.

Robert M. Riches Jr. wrote:
> My UP2000 is behaving strangely. After I replaced a noisy CPU
> fan, SRM wouldn't come up. The fan is spinning and giving the
> system enough of a tach signal for the PWRGOOD LED to come on
> and for SRM to try to come up.
>
> The problem seems to be centered around the single-ended SCSI
> chain. Normally, I have two hard disks on the LVD chain along
> with a Plextor wide CD drive and Yamaha CD burner on the
> single-ended chain. At Michal's insistence :-) many months ago
> I turned off all drive termination and put an Ultra-160 LVD/SE
> standalone terminator on the end of each chain.
>
> Whether I get the SRM prompt on power-up depends now on what
> I have plugged into the single-ended SCSI connector:
>
> - nothing plugged in to the motherboard: memory test is
> slower than normal, but the system can boot and run Linux.
> (Otherwise, I couldn't type in this plea for help.)
>
> - cable plugged in to MB, with or without terminator:
> memory test hangs (or takes more than 2X as long as it
> normally does).
>
> - Plextor and terminator on chain: memory test hangs but
> if I interrupt it "sh dev" sees the Plextor.
>
> - Yamaha and terminator on chain: don't get the "Testing
> the System" message, which normally comes right after
> the message about initializing GCT/FRU...
>
> Doing the deductions, it appears the Yamaha is preventing the
> "Testing the System" message. However, that doesn't explain
> why the memory test hangs or takes much longer than usual. I'm
> running SRM 5.8.81 if that matters.
>
> If the whole problem is the Yamaha burner, why does memory test
> take so much longer than usual depending on whether stuff is
> connected to the SCSI chain? Why should a possibly bad CD
> burner prevent the "Testing the System" message? Shouldn't
> that just cause the burner (and maybe other things on that
> chain) to fail to show up for "sh dev"?
>
> Any suggestions?
>
> Thanks.
>
> Robert Riches
> rm.richesverizon.net
>
>
>
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