Computer shut down randomly - Fans speed up?

[Gary7]

Hey guys,

 

 

UPDATE the computer will no longer fully power on. It will run the cpu fan at 100% then seem to go fluctuate to a lower rpm indefinitely until I forcibly power it off.

 

(Also started shutting down when it was moved or given a small knock)

 

It will also restart itself until I manually turn off the power supply. Sometimes powers on 10 times for 1 second each.

 

I really don't even know where to start here in terms of looking for the problem. PLEASE HELP

 

 

ORIGINAL POST

So recently I noticed that my PC will drop signal and shut down randomly and the CPU fan will ramp up. The sequence of events as follows

 

1. Gaming at normal gaming loads and temps (CPU 65c / GPU 70c)
2. Computer shuts down
3. LEDs on case stay on as well as CPU fan which gets a bit faster
4. Stays like this for about a minute then shuts down fully and reboots

 

I'm pretty worried about this and not sure where to start troubleshooting. 

 

 

Rig - None of my gear is overclocked

i5 4670k

MSI GTX 980

8GB HyperX Grey 1600 DDR3

MSI G43M Mobo

EVGA 500B PSU 

 

Probable cause : Stopped the CPU fan with finger last week to check what amount of noise is coming from each fan, shortly after that the same happened even though the temps were at normal ranges. 

[Goldensapling]

Mine used to do this as well. I think it's a driver issue, but I'm not 100% sure. Stopped doing it after a clean windows install so I'd assume it's driver related.

[Guest]

Sounds like a display adapter problem, not necessarily the graphics card itself as it could be the driver. I second trying a clean install. Also, rolling back driver might work as there was supposedly a recent NVidia driver that was calling black screens. 

 

Stopping a fan with your finger might damage the motor in the fan but shouldn't hurt anything unless your doing it for an extended period of time. I've stopped fans lots of time to see which one is making the most noise.