my computers been turning itself off, it happeed first like 3 weeks ago where it did it once, then it didnt do it for a while. did it again and now it wont even full load up without turning itself off. To get it to start back up again i have to play with the power switch. One time it messed itself so bad that i had to reset the CMOS. So what do u guys think i should do? change the ATX power suppy? anything i should know about doing that?