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z170mx Gaming 5 keeps restarting

z170mx Gaming 5 keeps restarting
« on: July 28, 2016, 08:04:56 pm »
I just built my new computer. These are the specs:

Motherboard: GIGABYTE Z170mx Gaming 5

RAM: 4x4GB Kingston HyperX FURY DDR4 2133Mhz

Power supply: Corsair CX850M

Processor: Intel Core I5 6500

HD: 1TB Seagate

Video: Geforce GTX970 EVGA SC

Plus 2 Corsair coolers.

After installing windows 10, my computer restart sometimes. It can take 1, 5 or 10 minutes. When it restarts, usually it restarts again 1-2 times just after the computer turns on.

I'm sure is not a heat problem - my cpu fan is well attached. I'm using default BIOS settings. I didn't had this problem before installing windows 10 - the computer would be on during one hour in BIOS screen and nothing would happen.

I didn't try BIOS update yet. The motherboard came with BIOS F3 version and I'm going to update to F4 tonight, but I don't think this is the issue. Can anyone help me? Thanks!