I have an EVGA nForce680O SLI MoBo. Recently, on boot up, I get one long and two short beeps and nothing on the monitor (it continues to indicate no computer attached). My video card tests as good in another machine. Any suggestions as to what is wrong?
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Check your MOBO manual for the beep codes. Those mean your post is failing and that will tell you at what point which may help you narrow down what piece is failing.