I had a maybe similar problem with 1 or 2 bad (but working) 128Mb memory dimm on a 9600 with PL G3/500:
cold boot : OK, computer never crashes
reboot : chime + black screen + nothing
upgrading CPU to 1Ghz PL G3 would definitly not work with these DIMM : same problem upon reboots + cold boot ok but computer crashed after some time.
marmotta said : " if I wait 45 seconds the screen appear "
This is normal to me, as it happens every time after a hardware configuration change (PCI slot or RAM). Could even be more than 1 minute depending on the 9600 config..
So I'd first try known working Dimms in the 7600.
+ Info : ONCE AGAIN the PowerMacs RUN FINE WITHOUT PRAM BATTERY. Without it, the only issue, ONLY after it has been unplugged from DC Power is, except a date/time loss, an NVRAM reset, which is not a problem as long as Mac runs OS 9 and has networking time. Not even a problem if you run OSX and the Mac never gets unplugged from power source.
cold boot : OK, computer never crashes
reboot : chime + black screen + nothing
upgrading CPU to 1Ghz PL G3 would definitly not work with these DIMM : same problem upon reboots + cold boot ok but computer crashed after some time.
marmotta said : " if I wait 45 seconds the screen appear "
This is normal to me, as it happens every time after a hardware configuration change (PCI slot or RAM). Could even be more than 1 minute depending on the 9600 config..
So I'd first try known working Dimms in the 7600.
+ Info : ONCE AGAIN the PowerMacs RUN FINE WITHOUT PRAM BATTERY. Without it, the only issue, ONLY after it has been unplugged from DC Power is, except a date/time loss, an NVRAM reset, which is not a problem as long as Mac runs OS 9 and has networking time. Not even a problem if you run OSX and the Mac never gets unplugged from power source.