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johnjohnchu
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No POST after OptiPlex 755 CPU Upgrade

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Just trying to upgrade my Dell OptiPlex 755's CPU from Celeron 430 to Core 2 Quad 9650. After CPU swap, CPU fan runs, light on the motherboard, and some long deeps, but no POST.  Please help.

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RE: No POST after OptiPlex 755 CPU Upgrade

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Are you sure that's a supported CPU?

Did you update to the latest version of BIOS before you swapped CPUs?

Are you sure it's seated correctly in the socket?

Ron

   Forum Member since 2004
   I am not a Dell employee

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johnjohnchu
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RE: No POST after OptiPlex 755 CPU Upgrade

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Thank you very much for the quick response.

It turned out to be totally my mistake.  I have used some old slow RAM incompatible with the motherboard as indicated by the lighted numbers in the front of the case.  Once that issue is corrected, everything works perfectly.  Now I have a pretty fast PC.

Regards,

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