|Try selecting the failsafe or default settings in bios to return them to OEM state. |
Sometimes you have to go through bios settings and save them even if you didn't change any settings to correct the F1 F2 issue at boot. It is saying that some setting is off. Any setting could be causing it.
It could be a failure with the battery maybe if it is new but weak. If you power down and the time is correct it may be OK.
Hang up and live.