r-barker

Hello! I built a new system this week and it's not booting to bios, all that happens is the fans start up, along with the HDD for around 3-4 seconds then shuts down and automatically starts again (in a loop). System Spec Intel Core i5-2500K 3.30GHz (Sandybridge) Socket LGA1155 Processor - OEM OcUK ATI Radeon HD 6850 1024MB GDDR5 PCI-Express Graphics Card Gigabyte Z68AP-D3 Intel Z68 (Socket 1155) DDR3 Motherboard Seagate Barracuda 7200.12 500GB SATA 6Gb/s 16MB Cache - OEM (ST500DM002) BitFenix Shinobi Gaming Case - Black OcUK Swift 650W V2 Silent Power Supply Arctic Cooling Freezer 7 Pro Rev 2 CPU Cooler (Socket 939/AM2/AM3/775/1155/1156/1366)) Kingston HyperX Blu 4GB (2x2GB) DDR3 PC3-12800C9 1600MHz Dual Channel Kit (KHX1600C9AD3B1K2/4G) I have taken the entire computer apart and tried again from scratch, yet I still get the same results. Everything is plugged in the correct places. I also checked underneath the motherboard to see if there was any m/f screws pointing up which could have been causing it to cut out, however there was none. All I can think of right now is that either the PSU is faulty, or the motherboard? Any suggestions? Would be appreciated!