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?
Forum Member since 2004
I am not a Dell employee
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.