Dual 2ghz G5 wont boot

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visorboy333's picture
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Last seen: 9 years 4 months ago
Joined: Dec 20 2003 - 10:38
Dual 2ghz G5 wont boot

I know its been awhile since ive posted, but its too early in the morning and my brain hurts. I need a couple possibilities to try out tomorrow morning.

As the title states, my G5 wont boot. Im not sure why. Hitting the reset button does nothing, and aside from cleaning and reseating everything on the motherboard, im not sure what to look for. Though im sure it something stupid.

Here are the symptoms...

G5 connected to a 20" Cinema display

Whether pushing the button on the machine itself or the button on the display for power, fans kick on, hard drive spins up, no power lights on either the tower or the monitor, though the PSU is on. Machine stays this way. Nothing on monitor, no drive activity.

What dumb thing am I overlooking?

You guys have yet to let me down.

Brenton

cwsmith's picture
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Last seen: 6 months 4 weeks ago
Joined: Oct 13 2005 - 08:23
Trial and (mostly) error

• Start by checking the RAM. Take out one pair at a time, trying each time to boot the machine, until there's only one pair left. If it still won't boot, swap another pair in its place and try one more time. Please note that RAM *must* be installed in matched pairs, starting from the centermost slots and working outward in a mirror image to the outermost slots. If your RAM currently isn't configured properly, this may in fact be the problem.

• Remove the aluminum processor cover (I can PM you with detailed instructions if necessary). Remove the bottom processor (as viewed in a normal standing position) and try rebooting. If still no joy, remove the top processor and put the bottom processor in its place. Try again. The machine can run with only one processor (in the top slot) indefinitely, or until you can find an *exact* replacement processor. You will need a long-shanked 2.5MM or 3MM hex wrench (to reach the screws waaay down between the processors). Again, PM and I'll get you more details. Once you determine which (if any) of the processors is good, you'll need to thermally recalibrate the machine with the Apple Service Diagnostic version 2.5.8. Otherwise the fans will run at full speed all the time (grain thresher mode).

• If it's not the RAM and it's not the processor(s), it's the logic board. Sorry.

visorboy333's picture
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Last seen: 9 years 4 months ago
Joined: Dec 20 2003 - 10:38
well it turned out to be a ba

well it turned out to be a bad stick of ram. and im fairly sure my battery is shot too. It boots now with a spare stick in it.

Thanks for the insight though

visorboy333's picture
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Last seen: 9 years 4 months ago
Joined: Dec 20 2003 - 10:38
Same issue has shown back up

Same issue has shown back up again. Even with new sticks of RAM and a new clock battery which I suspected bad to begin with. Aside from it being the logic board or one of the processors failing... whats the likelihood that its the PSU?

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