Question Cannot start PC . Long non stop beep after change cpu .

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Feb 22, 2019
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Im using Acer Aspire M3800 desktop with Acer G45T/G43T AM3 motherboard with the original cpu that is E5400 . I change the cpu to Q9500 but it wont boot + noisy non stop beep . Ive checked the mobo is compatible with C2Q cpu's . But why im having this issue . I try to change to old cpu it can run normaly .