The BIOS is looking for a drive that isn't there.
Go into your bios settings, usually by hitting DEL at startup (can be other buttons but will say on one of the first screens)
Find the settings for boot order, the first one may say CDROM or Floppy. It will be a drive you don't have so change it to one that you do. Check the full list of options because some boards can tell the difference between a CDROM and a DVDRAM drive.
Next time you boot up it will avoid the F1 process.