just to comment on iron crosse's statement, bios settings r stored on a PROM chip on the mother board and formatting the HDD isnt going to reset those (what a pain in the a** if isnt even gonna fix it) if the bios is the culprit but since that was the last thing installed and having a messed up bios will definitely cause a no boot situation, i would flash the old bios back in (perhaps u got the wrong update or someone messed up and its not compatible with ur mobo, regardless put it back the way it was when it was working correctly) reset all the bios setting to default and auto detect everything and tweak everything back so it all works rite.
it could always b a hardware problem too. such as the HDD or memory or something decided to crap out at the same time u updated, unlikely but possible.
Fear is nothing but the anticipation of pain, be it physical, mental, spiritual or emotional.
Athlon XP 2200+ oc\'ed @ 1.93ghz
Nvidia mx420 :(
60gig maxtor 7200rpm
Dual boot with Mandrake 10.0 and Win XP Pro sp2