Settings Were Changed in BIOS
Certain changes in BIOS settings (such as chipset timing or latency, memory timing or latency, processor clock frequency, etc.) can cause a system to no longer boot.
If you are able to enter the BIOS Setup by pressing F2, reset the BIOS to factory defaults by pressing F9. Save and exit the BIOS Setup.
If you cannot enter the BIOS Setup, clear the CMOS:
- Turn off all peripheral devices connected to the computer.
- Disconnect the computer’s power cord from the AC power source (wall outlet or power adapter).
- Remove the computer cover.
- Locate the battery on the board (see figure below).
- With a medium flat-bladed screwdriver, gently pry the battery free from its connector. Note the orientation of the “+” and “-” on the battery.
- Wait one hour then replace the battery.
- Replace the computer cover.
- Plug the computer and all devices back in.
You may also need to perform a BIOS Recovery after clearing the CMOS.