I shut down my computer as normal last night having had no problems. Slept, and this morning it doesn't work. When i press the power switch it will come on for ~8 seconds, it then power cycles itself ...

I woke up to dead computer this morning. The motherboard has got power. It appears to power up when I push the power button. The harddrive clicks a bit. Nothing on the display-no bios-no nothing.The ...