tfronau

macrumors newbie
Original poster
Jun 7, 2012
3
0
Early 2009 MacPro 4.1Quad 2.93 GHz, 8 GB, 10.6.8
When I turn it off, it won't boot. No light no power nothing. I have to unplug the computer, remove the cover, reset the switches on the motherboard, plug it back in, and then it will startup. Why? What would cause thiis?
 

highdefw

macrumors 6502
Apr 19, 2009
259
0
dead power supply? The easiest way to know what's wrong is to take it to Apple.
 
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Dr. Stealth

macrumors 6502a
Sep 14, 2004
812
724
SoCal-Surf City USA
Check the Battery

Check the battery. Or just replace it to be sure. It's cheap. It's under your graphics card.

Could be power supply failing though. :(
 
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tfronau

macrumors newbie
Original poster
Jun 7, 2012
3
0
Won't boot, no power unless I reset

I replaced the battery, no change.

The power supply seems to work once I push the reset buttons on the motherboard. I don't think it is the ps. Can anyone tell me what the reset buttons on the MB do?
 
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tfronau

macrumors newbie
Original poster
Jun 7, 2012
3
0
It was the power switch, but they had to replace the entire case.
 
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