Help, my pc loses the signal with the monitors and the fan start to full speed

Hi. I have a problem with my pc in the last 3-4 weeks.
It started to lose the signal with the monitors and the graphic´s fan or cpu´s fan start to full speed and it makes a lot of noise but the pc works without the signal. When it starts i need to disconect the pc for fear of something worse.
The problem is random, i can stay with skype 10 minutes and the signal is lost and the fan begins or i can stay 7 hours playing battlefield 1 and i havent got problem.
I did ddu with nvidia driver and i installed a stable version. I believed that the problem was fixed because in 4-5 days i hadnt got it and i was using the pc a lot.
But today the problem started again.
The temperature when im playing a game is 50-55ºC with 30% fan speed
I have done today heaven benchmark and the temperature was 60ºC with 40% fan speed and everything was perfect.
My pc is new, i bought it in october.
The specs are:
Intel i7-6700K 4.0Ghz
Gigabyte GeForce GTX 1070 G1 Gaming 8GB GDDR5
MSI Z170A Gaming M3
NOX Hummer 80 700W
Kingston HyperX Savage DDR4 2666 PC4-21300 2x8GB 16GB CL13
Seagate Barracuda 7200.14 1TB SATA3
Windows 10 Pro
Reply to ivanose
5 answers Last reply
More about loses signal monitors fan start full speed
  1. Do you find the solution finally?
    Reply to Edward40
  2. Yes, i did
    Reply to ivanose
  3. What was the solution ? I'm having the same problem now
    Reply to Chrilexgaming
  4. Chrilexgaming said:
    What was the solution ? I'm having the same problem now

    The problem was the power supply, a wire was bad connected and It was doing a short circuit.
    Reply to ivanose
  5. Did you replace the entire power supply?
    Reply to Chrilexgaming
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