Computer restarts infinitely after Bios/Motherboard screen

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http://superuser.com – Every morning I turn on my computer (which is relatively new) and I never had any issue with it until now. It starts booting, shows that very first screen which has some motherboard picture, then it show which buttons to press to enter BIOS and etc. Then it restarts over and over again every 3-5 seconds. What could it be? I unplugged the power cable, checked all the cables, moved the case, it had some wires stuck under it, blew some dust (but didn't open the case yet) and I tried to boot again and it booted successfully and I am writing this issue now. My specs: i3-3220 3.30Ghz 8GB DDR3 RAM (HowTos)