Hi, I have just replaced my motherboard which is Asus m5a97 me r.2.0 and the processor which is now fx 6350 3.90 GHz and new memory DDR 3 4gbs,I still have my old 550w PSU also the original hard drive I reinstalled windows 7 which went well about half hour later it started shutting down for no apparent reason. I am at my wits end ,hope someone can help.many thanks. Alex.