need help.pc problem

[bobrik75]

thanks for tryin to help me.
but....
i dont think thats happend beqouse of overhiting,one time thats happend right after i turn on my PC.there was no time for overheating-
and temperatur of PC 33.degris
and grafik card 43 deg,after i finish playing its about 53 butafter 1-2 min its go down-its normal temperatur.
first time when its happend it was black screen wtith green lines,after i change a driver its come now only black screen.and this problem whith restart and turn off PC,when this happend i kannt do it,only take it out from power,whei i take it back evrithing fine.PC work ,maybe 1 houh maybe 1day.but than again,
so.....?????