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Power light goes out but power remains thr...
By diaryofacarp on Jul 03, 2009
but no power thru usb ports or video monitor; reset pmu switch; replaced battery; red light on mother board remains on; fan speeds up and slows down heat coming off prossesor; if i hold down power button for 5 to 10 sec power shuts off hit power button again power comes on but light goes off tried all combonations on key board to trigger a restart but i dont think the key board is registering no lights come on the key board ;unplug the monitor from the computer and it says cable unpluged plug it back in and and the monitor goes back to sleep ....//////please help??????
Clarification Request
Posted by darksidegds on Jul 07, 2009
now this is with a desktop not a laptop right? and the key combo for a reset is Command + Option + Power Button. Thats the equiv.. to a Ctrl + Alt + Del on a windows system. But does you mac turn on and load to the desktop? or does it just start up and hum, and nothing on screen and all peripherals don't respond as well? If that is what you are getting then the power supply needs to be replaced. I've had that same issue once with my PowerMac G4 Dual Proc. (ya i know you can start up and the fan hums and all but thats the fan for the power supply not the fan for the board. if you have a older mac the cost for a new power-supply shouldn't be that much. And you can probably order it and replace it yourself. a good cheap place i've found so far is here: http://stn2.headgap.com/resale/FMPro?-db=OrdersC.fp3&-format=products.htm&-new
Solution #1
posted on Jul 07, 2009
you need to replace the power supply. The fan sound is the fan for the power supply and not the computer. for cheap parts or used goto headgap's. They know what you need and probably even help you replace it yourself.
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