I've come home today and switched on the PC I've built a few months ago only for the machine to whir for a few short seconds and then die. It repeats this until I disconnect the power lead. Nothing is output to the screen and this cut out happens very quickly after switching it on.
What could this be and how could it be fixed? Is it the power supply? I'm in despair :-( My spec is below, everything is new and was bought and assembled within the last 6months, system has been fantastic until now.
Power Supply: 620W CoolerMaster Real Power M620
Motherboard: Gigabyte GA-X58A-UD3R Intel X58 (Socket 1366) DDR3
Processor: Intel Core i7 930 2.80GHz @ 4.00GHz
RAM: 6GB DDR3
OS Windows 7 64bit
Sapphire HD 5770 Vapor-X 1GB Graphics card
1TB Hitachi HDD 720GB Seagate Barracuda HDD 350GB Seagate Barracuda HDD EMu 0404 PCI Soundcard
D-Link PCI-E wireless card Samsung DVD RW drive