CPU upgrade boots first time, but then not ...

[Christian Leue]

 > I've installed a Gigadesigns Cube upgrade CPU which I obtained from 
OWC recently.
 > Installation went fine - booted first time post upgrade. I powered up 
for the 1st time
 > with the new CPU and the system boots fine and runs fine. If I tell 
the system to
 > restart (pretty much straight away - before any heat issues could 
occur) the
 > system does not boot (no chime, no self test). If I power-off and 
press the
 > motherboard reset button, then power up and boot, the system boots ok.
 > But only that one time.

Hello, Alan!

Sorry I can't offer a solution to your problem, but I can see very 
similar behavior on my Cube with the Gigadesigns upgrade: it restarts 
fine, but once I power it off, it no longer boots. I can hear the hard 
disk spin up, but no startup chime. My solution (besides not 
intentionally powering off, of course) is to pull the core and press 
the CUDA switch. Then it boots fine again, but only once...

I have tried all the usual suspects: replacing battery, powering on 
with the programmer's switch pressed, zapping the PRAM and resetting 
OpenFirmware. no luck.

Have you had any improvement since you posted your message?

Cheers,
Christian