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Apple Desktops Discussion of Apple's desktop machines including Mac Pro, iMac, Power Mac, and mini

Just swapped imac G5 logic board, now no USB or IR keyboard/mouse function

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Member Since: May 20, 2008
Posts: 8
Jenn is on a distinguished road

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Hey all-

My dad's capacitors burst, giving him crazy video issues and then kernel panic. So I bought him a parts imac on Craigslist with a supposedly good logic board. I just swapped it out and everything went well, but his IR keyboard won't work, and neither will his USB mouse.

Any ideas? Something I screwed up during the swap? Just another bad logic board? Any tests or workarounds?


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Member Since: Feb 21, 2009
Posts: 14
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Are you sure that the motherboard you bought was correct type? Also when it was installed, did you make sure there are no short circuits, that it is in place perfrectly and no screws etc are touching the backside of the board? Does keyboard and/or mouse lights lit when you power up the machine? Can you get into open firmware by powering up the machine and immediately pressing CMD, ALT, O ja P keys together at the same time? If it does get you to open firmware then USB-ports are working but there is something wrong with OS X. Try doing PRAM-reset by pressing CMD, ALT, P and R -keys at the same time right after you have pressed power button, you should heat loud noise and probably see the sleep led flashing, after you hear the chime second time you can let it to boot normally.

I personally would have changed the cap/caps since motherboards tend to be expensive....
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Member Since: May 20, 2008
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It's definitely the right board, your idea re: screws etc touching the reverse of the LB is a good one; my best hope at this point!

Neither the keyboard nor mouse lights up when it's plugged in.

I haven't yet tried the specific keystrokes you suggest (I'm still at work), but I look forward to trying. I did try to start up in safe mode, and in target disk mode, but neither had any effect. Even plugging my iphone headphones into the jack didn't silence the startup jong noise.

Thanks for the ideas. I'm gonna dive back in hoping to find a short.

Wish me luck!

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Member Since: May 20, 2008
Posts: 8
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(Sorry for the B2B)

My laser mouse gets power from the imac (but doesn't work), but NO startup keystrokes work:

target disk mode
safe mode
select startup folder

Any ideas?



The wireless (IR? BT?) keyboard won't work either. Might there be some sort of sw conflict involving that?

Damsel in distress over here!
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