Black screen after Xp loading screen

Searched everywhere, my pc today decided to go black screen right after the Win XP loading screen the one with the blue dots crossing the screen. right when Windows User select screen WOULD load the screen goes black, still on because the monitor never sleeps but black. Safemode and last known config work either, safe mode fails at the loading of .sys files. I have reset the CMOS, tried a new gfx card, and diff things no luck sill. as hl2 ep 2 is now out im freakin out, anyhelp>>>>?????