After upgrading to a newer processor, such as to the Intel® Pentium® processor E5000 Series or the Intel® Core™2 Duo processor, the system will not boot:
Confirm with the manufacturer of the motherboard or computer that the board is validated for the processor frequency, stepping, and voltage. The stepping is the hardware revision, and it is possible to have processors at the same frequency but different steppings. Some steppings may not be compatible with your motherboard.
The BIOS on the motherboard may need to be updated to support the newer processor. The BIOS update files would be available from the system or board manufacturer.
When working within the computer case, cables and other pieces of hardware can be knocked loose. This applies to power cables for drives and fans, as well as for the ribbon cables for the disk drives. Make sure all cables are seated properly by either pressing them into place or removing them, one at a time, and reseating them. If this is a process you are not comfortable with, you may wish to contact an Intel® Premier Provider.
Your vendor, or a reputable local vendor, should also be able to test the processor in a compatible system.
Upgraded processor - The motherboard's BIOS needs to be able to identify the CPUID of the processor. Supported motherboards will have this information added in the newest BIOS release.
This applies to: