|By 'bios boot screen' do you mean the normal logo or posting screen when you first turn it on or do you mean it opens into bios setup? If it's the normal screen does it give an error message? |
Instead of F2 try tapping F1. Often F1 is the key to 'continue' without going into bios setup.
Might be the cmos battery. Check that the date is correct in either bios setup or windows (when you have a successful boot). If the date is way off it's either a bad cmos battery or somehow the date was changed.