Right so I'm after building a new computer with parts in total costing 1500 euro. These include intel i7 cpu, gtx580 graphics card, 8gig ram and asus motherboard. I put everything together correctly but when I turn it on via case power button, it only stays on for 30 seconds, then restarts and stays on for well over a minute and then turns off and doesn't restart. If I then turn the power supply off and on again and press the case power button, the exact same thing reoccurs. The memok button flashes red but pressing it only causes it to blink but changes nothing. When I hook it up to a monitor, the monitor says "no signal". Everything is brand new and this is the first time it has been used. I bench tested it but the same thing occurs regardless of what's plugged in and what's not. The same thing happens if there is no ram in or no graphics card in. The cpu is in correctly and the cpu heatsink and fan are installed correctly. I tried the PSU in my brothers computer and it works fine so I'm guessing the PSU isn't the problem. Though it is an Ezcool PSU which isn't exactly the best make. I really need help with this and would appreciate any solutions you guys might have. Thanks.