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The computer cannot start recently. When i press the power button to switch on the computer, the Power LED light flash once and disappear. The computer does not run at all. The CPU fan is not spinning, hard disk not running. Except the power supply fan is spinning because the psu is OK.

I try to change a good working power supply just to try and the same thing happen. What is the problem?

Thank
 

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Well right now it is sounding a lot like a bad board but lets do some troubleshooting first.

I would start by swapping out the RAM. First re-seat each stick. Then, try running with one stick, then the other. Additionally, re-seat other socketed components like the video card and CPU. Be sure to do a fresh application of thermal paste.



Make sure your motherboard speaker is connected and facing the right way. The speaker is polarized, so if it is plugged in but you hear no beeps, turn the connector around and listen again.
 
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