Did you tweak the BIOS?
Boot up your PC. When you see a message like Press Del to enter
BIOS or press whatever button to enter BIOS, press that
button.
Select Load Fail-Safe Defaults and press Enter
You will get a warning, just press Y for Yes.
Then move down and select Save and Exit Setup. Press Y for Yes and
press Enter to exit.
The below picture is what you should get when entering the
BIOS.
