When I startup my CPU,suddenly there are beep and the monitor,keyboard and mouse doesn't work.Please help

aWildLuke

Honorable
Dec 30, 2013
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10,690
It's gotta be the MoBo. If you already tried with a different PSU and RAM, checked voltages, and still fails to POST, there's no other way. If it was the processor, it would beep a warning.

Send that MoBo to warranty if so