PowerMac G5 dual 2.00 GHZ not booting up, 3 blinking lights, fans running high


macrumors member
Original poster
Aug 5, 2018
sucks cause I literally got it 2 days ago in working condition

Edit: I read it may be a problem with the logic board or the RAM. Not really sure though


Oct 31, 2017
Unfortunately your research is correct, it's a problem with the logic board. To confirm you can try pressing down on the board in the center of the box I've highlighted and it'll probably boot. You can replace the motherboard or attempt one of the "reflow" repairs (heating the area with a heat gun or pulling the motherboard and putting it into an oven) but those are, at best, temporary.


Project Alice

macrumors 65816
Jul 13, 2008
Post Falls, ID
Before you jump to extremes

may I recommend re-seating the existing RAM or trying some other RAM before you pull out the motherboard and try and reflow the chipset?

because 3 beeps is No RAM passes POST

and yes while it is a symptom of a failing memory controller on a G5, you could also just have bad RAM
I second this G5s are also very picky about RAM.
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