Windows XP boot problem

I had recently taken my computer apart to do some modding to the case (installing LCD) i now that i am done, my computer wont boot into windows. I hit the power button, it display my drives, goes to the windows XP home boot screen, the for a split second it goes to the blue screen (A problem has occured), and restarts.
I believe i had the problem before and it was either the graphic card or ram that caused it. i wiggles them around and i still cant get this thing to work

someone help me out

try the safe mode

whenever it gets to the loading screen, 2 seconds later it reboots. nomatter how i try to stat up

Oh boy....my moms comp did the same thing.....had to RMA it...try booting to a flopy and runing chkdsk /r i believe. then download all the latest updates for windows. This trick only works once (i know that wierd but the seccond time it wouldnt boot to a flopy)...good luck