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M2n78 La Motherboard power problems

Last response: in Motherboards
November 28, 2010 12:59:49 AM

computer powers on, steady and strong green light in back, power light is on, HDD light comes on and stays on. CPU and case fans turn on then back off after about 3 seconds. the monitor does not come on, nor does anything else happen. installed a secondary hard drive, that turned out to be defective (as 3rd master), then removed was fine, then it was turned off and the problems listed started
January 3, 2011 4:48:14 PM

I am having the same problem except fans stay on. I have replaced the power supply, swapped video cards, swapped memory. I get no signal to the monitor and no beeps from board. Before it died the video was going in and out with corrupted output. I think it is the motherboard, but is there anyway to make sure?

Thank you in advance

Asus M2N78- LA MB
OB 9100 graphics
MSI 460gtx
Thermaltake TR2 700w ps
AMD 9550
4*2mb gen ram
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