EMERGENCY!!!HELP

my configuration is
2.66dual core
intel DG965ry chipset mother board
2gb 800mhz ram
XFX 8800 alpda dog extreme edition
400watt power supply
os is windows vista and xp

my problem
one day back my computer used to freeze and all of a sudden when i rebooted my pc i was gettin some DCHp error or something like that.then i tried removing the wires and joining them back again.it worked,but then it gave me some other error as in no boot something error.so i went into bios and changed my chipset configuration and made it 800mhz which was 500 before..and then i just exit with saving the setting and then nothing showed on my screen.it didnt even show me the bios setting or anything like that.i doesnt basically show only.so i removed my graphics card,my sata hard disk and the normal hard disk,ram.then try rebooting the pc but still facing the same probelm.there is no problem with the ram that is sure because if i remove the ram it gives me 3 beep and if i place it back it doesnt beep.so my ram works fine.but just as soon as i made my chipset configuration changed to 800mhz my fans started to work in high speed,all fans are rotating at a high speed but no display at any cost.so what shuld i do??please help me out here..i even removed the battery just so that something by any chance would help me,but no help with that also..
so any clue what can i do to fix my problem