I got a custom IBUYPOWER computer on Dec 11th, recently the AzzA 500w PSU failed. I decided to get a new one cause i need to compute, i got the 'Sentey® Power Supply 550w ' and now windows 7 64x wont start up. It says starting windows for a few seconds two of the swirly dots appear for a split second than is crashes and restarts. Ive tried clearing CMOS, checking HDD's/RAM. everything i can think of.