BIOS failure

[wtjs]

Original motherboard and v7.16 BIOS which is AMI. Board labelled AMI Aptio DT 2006 AD037971. Only system updates have been 8 GB RAM and replacement HDD. Attempted to install ASUS GT710-SL-2GD5 graphics card in 16x PCI slot. It installed, and worked after a fashion with improved playing of video. However, when card installed it became impossible to open BIOS with F2 or F10. It also took a long tome to boot into Windows. I removed the card and decided to try what now seems an unwise plan. The BIOS setup became accessible again and I disabled the PCI 16x slot with a view to enabling/ disabling the ASUS card without physically taking it in and out, so that I could try to make it work properly. The machine then refused to boot beyond the first page which identifies the 8 GB RAM. I have tried everything to persuade the system to start, with and without the ASUS card in place. It will display SETUP on pressing F10 at startup, but won't go any farther. I have tried the forum for BIOS failure routines, placing the BIOS v7.16 files on a USB, pressing Windows-B and everything else I can think of. I even tried an ancient page from this support site which referred to renaming the *****.ROM file on the USB to HPBIOS.ROM and trying to boot with Ctrl-Home - this produced no effect at all. This is not surprising as that page stipulates putting that file on a boot floppy, and this board has no floppy controller! So what I am trying to do is revert to the BIOS settings in which the x16 slot is NOT disabled- is the system waiting for something from the ASUS card which it now can't receive because I disabled the slot? Is there anyone there with experience of these old motherboards? Thanks

[GamingOptional]

Just Clear CMOS  and you should be fine.

[wtjs]

Thanks, but I had already tried all the easy stuff like clearing CMOS. I haven't cleared passwords though, because that's the only connection I have with the system board.