On Jan 15, 2011, at 4:43 PM, Paul wrote:
My Quad has no video out. The Graphics card is known good,
Is the display known good? Could be a bad display or backlight?
I tried resetting the PRAM, Removing battery, I can't see the screen
so NVRAM
Reset was done blind but still no good.
When you reset the NVRAM 'blind' you should still hear the restart
chime after the "reset-all" command. Did you hear this chime?
On thing I did notice is the keyboard doesn't respond to the ZAP PRAM
Key commands. That would make me think the Pram is corrupt.
How do you know when you can't see anything on the screen? I assume
you're saying that when you hold the Cmd-Opt-P-R you don't hear any
chime?
Any help other suggestions on this...other wise I think the logic
board I bad.
You sure it hasn't leaked coolant or had a power supply issue? There
are situations where some of the power supply line voltages die, but
others are still good, and it appears to be trying to startup, but the
power supply is blown. Since the power supply is in the direct line of
any coolant leakage, this is a common problem if you have leakage, and
somewhat common without leakage also. I'd be looking hard at the power
supply. Get a pin-out diagram and test the voltages with a multimeter.
Without a display, you won't be able to run the hardware test CD or
anything else, so testing the voltages directly is a good place to
start. I'm betting you'll find something wrong with the power supply.
Any way to reload the firmware?
I don't think so. There weren't any updates issued for the quad G5
firmware. It's highly unlikely this is the problem.
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