This message was posted on behalf of Intel Corporation
Thank you very much for joining the Intel motherboards community.
The troubleshoot steps you did are actually very good in order to try to fix this problem.
Just to make sure, if you test the PC without the hard drive and just with one memory stick, are you able to access the BIOS?
We can try also a BIOS recovery:
This is the .BIO file needed for version 0457:
We can also try to clear CMOS:
Did you test the PC outside the chassis?
Do you have the option to test your processor on a different board or to test your board with a different processor?
This will be the last step to do in order to try to find the source of the problem.
Please let me know the results of trying the steps above.
NOTE: These links are being offered for your convenience and should not be viewed as an endorsement by Intel of the content, products, or services offered there.
Any further questions, please let me know.