I have a Asus P5K SE motherboard and I recently changed the CPU from a Core 2 Quad to a Core 2 Duo. After the change a message displayed at the very beginning of the boot:
Unknown CPU detected, Bios update is required to unleash it's full power. The system will shutdown after 25 seconds.
I believe this indicated that I must perform a BIOS update. The problem is that I cannot boot. Not into windows, nor to CDROM or anything else. It is not even letting me to enter the BIOS setup.
How do I flash the BIOS without being able boot from anything?
Thread UPDATE: I was able to flash the latest BIOSs without changing the CPU using the integrated ASUS flash tool; after flashing the BIOS successfully and rebooting I got rid from the CPU message; instead I got this message. I removed all the USB devices, and the front USB wires, and placed the motherboard on a non metal surface but still have this USB message, any ideas?