Its asking you to Press "F1" key because may be its having a hardware problem,
which should be checked or need to adjust the settings in BIOS. It also an
indication to replace the CMOS battery.
Try this 1.
Go to your BIOS and load default settings. Also check the date and time in BIOS.
If you don't have a floppy drive then Disable the Floppy Mode option in BIOS.
Look for the option "Halt On" and set it to "No Error".
Save the settings and exit from BIOS.
If the problem still exits, change the CMOS battery --> Go to BIOS and load
default settings --> Make sure to disable the floppy mode if you don't have a
floppy drive --> Set the first boot device as "HDD" and save the settings and
exit from BIOS.