If the drive is not correctly installed/connected then it will not show in the bios.Similarly... if you flashed firmware for the CDROM... possibly you may done it a damage permanently and the unit is now useless. But I may be wrong in the last (firmware) regard; "not having dun wot" you did... I can't comment from experience. Possibly others may have more input overall?
How is the drive installed, as in is it set to be a slave to current master HD, or master (on its own eide channel)? Or are you using cable-select?
Also is the ribbon cable properly installed at both ends; and have you go the cable the right way round? There are still some ribbon-cables around with plugs (and some Mobo possibly too) which can "sometimes" allow a ribbon to be installed the wrong way round.
Pin-1 to red stripe on cable (both ends).
Both are discussed rather simply at:
http://sony.storagesupport.com/cgi-...
If the ribbon is NOT installed correctly - then no see in bios...; likewise if NOT properly/securely installed - at both ends... then again no see in bios.
Check all the above first...?
Also visit Lite-on webiste: specifically:
http://us.liteonit.com/us/index.php...
for firmware updates, manuals etc...; you will need to select optical storage and then model number from appropriate drop-down menus.
Bios settings/options "usually" allow a reset to factory defaults; use that?
But if you haven't changed things there... there "didn't ort-a" be any need to reset bios?
Check the above items first - is the drive properly installed etc?