Thanks to all who responded. To continue in the hopes of gleaning more
wisdom, here are some clarifications:
1) the computer used a standard VGA-based 17 monitor, though I did try a
spare 15 ADC Apple display to see if it was a port-specific problem on the
video card (no go).
2) As mentioned, I cannot reset the PRAM or NVRAM, as the boot sequence
will not go far enough to query the keyboard or other peripherals (like the
optical drive).
3) I did swap out the HD and put back in the known-good Apple OEM HD, again
no luck, but I can re-attempt with a different HD.
My sad suspicion is the motherboard (first) or processor board, but want to
exhaust all options before I begin parting out the good components.
Many thanks again,
Dana
On Sunday, September 16, 2012 7:46:07 PM UTC-4, DLC wrote:
Greetings all,
I'd like to seek advice for those who've tread down the path I need to
take. A while back I donated a G5 tower (June 2004 model, 1.8GHz DP w/ PCI
slots) to a small private school. Recently I was told by the teacher that
it just stopped working, so I took it in and ascertained that the video
card was the most likely culprit (issue= boot up chime, then
nothing-nothing fires up, except the fans going full tilt if you wait a
couple minutes, then you need to do a hard shutdown). Apparently not, as a
replacement card (known good) and a 2nd used one I had failed to remedy the
situation. Re-seating RAM, pulling 3rd party cards, new PRAM battery,
returning unit to OEM status, and resetting the board all proved fruitless.
So, I'm inquiring from those in the know what the next step is. Alas, all
keystroke related remedies (resetting PRAM, NVRAM, single user and verbose
mode, C key for optical, etc.) are not an option - the boot-up mode does
not get far enough in to query the peripherals or seek an OS.
I fear it may be bad processor or logic board, but maybe there's a way to
verify or get around?
Many thanks for any input.
Regards,
Dana
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