At 19:18 -0700 08/03/2005, Adrian O'Sullivan wrote:
BUT ... on the negative side ... I've just attempted to upgrade its sister vessel (an identical S900 with the same 50 MHz bus speed, also built by me from more-or-less empty case) from a Sonnet G3 Crescendo 400 to a Daystar/XLR8 G4 ZIF (also purchased new from Daystar). And it's a dead parrot!! No chimes. Black screen. Nothing. I've swapped out the chips several times. Done all the usual PRAM-Zap and CUDA routines too. I've stood on my head at least three times, and I've prayed to many different deities, but no luck.
Do you have any of your old CPU cards available? Like the old Sonnet, or even a 604(e) based card--or even an old PPC601/100 from a 7500? I would try testing with one or more of these other CPUs first, as it's pretty easy to swap CPU cards out.
My first thought was that you might have corrupted NVRAM, but I think one still gets a chime in those cases (followed by black screen), and besides, you stood on your head three times.
The guess I feel best about is that your power supply just flew south for eternity coincidentally with the CPU change. So you may wish to swap power supplies between the units to test. That'll be a pain, so I apologize in advance in case I'm wrong. :-)
Check that all the PS connectors are connected. I had one machine that drove me crazy because it would boot fine with a PPC604/150 card but not with anything newer or faster. It turns out the 3.3V connector from the PS was loose and apparently the 604/150 uses 5V but the newer cards need the 3.3V supply.
Finally, in cases where you're not getting a chime, it is sometimes useful to remove all the PCI cards and RAM (works on the S900 because there's 16 MB on MB), disconnect all the SCSI etc. cables. Do the old, pull the battery, unplug the machine, play press the button wiht the CUDA button, let it sit overnight. Then play with CPU cards until you get a chime. Once it's chiming again, you can worry about fancy things like getting video output.
Oh, is your speaker connected? And is the audio jack at the front of the case connected properly? If that audio jack is disconnected, the MB thinks a headphone is plugged in and the speaker is disabled. This is important because a non-chiming machine is quite different from a chiming but black screened machine.
If all that fails, you might try moistening a bit of card stock with some 95% alcohol (try the cosmetics section of most grocery or drug stores) and inserting and removing it from the CPU slot a few times. Also, check for grease, etc. on the pins of your CPU card. Sometimes we get the heat sink grease in places it doesn't belong.
For that matter, I think you can plug a CPU in that second CPU slot just to test teh board, though I've never tried it myself, so take that with a block of salt. It's just the pinout in that slot is the same so it ought to work and that would identify CPU slot problems.
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