At 8:51 AM -0800 12/27/2008, Aaron wrote:
>My FireWire 800 MDD chimes once when I try to start it

So the self-test has succeeded - cpu, buses, etc, are ok.

>and generally powers up, but does nothing else. The monitor stays 
>black, the little light on the monitor stays amber, and, if I hold 
>down command-option-P-R or command-option-O-F, nothing happens 
>either.
>
>I've tried it over and over again with and without a variety of 
>components and cards, all of which work in my Dual 867 MDD. Although 
>both my PRAM batteries probably should be replaced (and I'm about to 
>order them), either one will start  up the Dual 867, which is the 
>computer I've been using for a week or so.
>
>Any suggestions as to what might be wrong? Power supply? Motherboard? CPU?

Try booting from an OS X DVD.
If that doesn't work, pull the HD interface cable, and retry booting 
from the DVD.

- Dan.
-- 
- Psychoceramic Emeritus; South Jersey, USA, Earth

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