If the BIOS is corrupted, you can try holding Windows + B (or Windows + V ) while powering on to trigger a recovery from a USB drive. Regarding BIOS bin file - HP Support Community - 8008102

The comes in three form factors:

The binary file is usually named after the BIOS family, such as for the dc7900. HP Support Community BIOS Recovery Procedure

However, if you are a retro-computing enthusiast, a data recovery specialist, or simply love this machine— Use SP51322.exe extraction or consult verified dumps on Badcaps.net (search for “dc7900 bios dump working”).

HP Compaq dc7900 (Ultra-slim Desktop, Small Form Factor, or Minitower). System ROM Family: 786G1.