hi all im new to techspot,my computer keeps freezing.my friend who built both my last 2 computers has done all kinds of checks,tested hardware n software and pinpointed it to motherboard,replaced motherboard with new ram aswell n worked fine for 3 days then started freezing again then wouldnt boot up.replaced graphics card worked ok for 2 days then started to freeze again then wouldnt boot up,ive just ordered new 1.5tb hard drive if its not that only thing left is power supply,ive also replaced a few of the cables as i had new ones.i must say my friend who is a genius with computers and has worked for numerous computer companys no's wot he is doing and its totally thrown him he's never come across this,its totally random ive even got new 22 inch monitor which someone said it maybe but i didnt get it for that reason my old needed replacing and my partner got me an early xmas present.its so annoying can anyone help please