New pc keeps restarting at Bios Screen

Dear All,

Yesterday I finished building my first system (Gigabyte GA-Z68AP-D3, Intel Core i5 3550K 3.4 GHz, Corsair XMS3 2x4GB, Gigabyte GTX 650 ti 2GB). Once I power it on, all the fans are working, everything seems fine however when I see the BIOS screen keyboard (USB) won't work and the system restarts. This keeps happening over and over again until I force a shut down with the power button.

I took everything out, reassembled the pc, tried booting with minimum components (CPU, heatsink and ram) and the same thing keeps happening, restart at BIOS screen. I also took out the MoBo battery for an hour, installed again but nothing.

I suspect it's the motherboard but I'm a total noob.

Any ideas or recommendations would be more than welcome!

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More about restarting bios screen
  1. Use a USB 2.0 mouse and a PS/2 keyboard.
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