Post back the verbatim error message and when it occurs exactly.
F2 is BIOS setup, so enter BIOS setup and see if Floppy appears somehow in BIOS Boot Order or where the drives are registered - IDE or SATA Storage listings most likely. If so disable any floppy listings.
Check on HP site that you have the latest BIOS version update.
There are many steps which have piled up that have not been replied to so I would next go back through the thread and catch up, report back results on each step so we know what all you've done.