Re: Ultra 5 problem

From: dion_b (dion_b_at_nospam.no)
Date: 11/28/05 

Date: Mon, 28 Nov 2005 18:51:25 +0100

prenaud@primus.ca wrote:
> I recently picked up a bunch of stripped 360 mhz Ultra 5s at a local
> computer junk store.
> (Stripped of all the PCish components, power supply, hard drive, cdrom
> and memory.
> Yep, even the memory even though it is useless in a regular PC)

Ignorant sacrilege :'(

> I was able to rebuild and revive a couple but 2 of them have a problem.
> The main sympton is that no boot messages appear on the monitor.
> One main difference I have noticed is that the green LED over the power
> button
> does not light up. I have swapped out the CPU, nvram, power supply and
> the
> memory SIMMs from a working Ultra 5 270mhz machine but no go.
>
> Any ideas anyone?

Sounds like a power issue, which, given PSU is known to work, sounds
like system board...

Possibly just a bad cable or connection, though. Try booting with all
cables apart from PSU, keyboard & monitor detached.

> Also, can I interchange the CPUs and the memory between 270mhz and
> 360Mhz
> Ultra 5 models?

You can certainly run a 270MHz CPU on a board from a 360/400/440 system.
Vice versa is not supported (the board has a lower max bus speed), don't
know exactly what would happen if you tried anyway. I know that using
50ns DIMMs on an older board works fine (they just run at 60ns
settings), 60ns DIMMs on a new board also work, the OBP detects them and
runs them accordingly.