My new gaming pc shuts down when it gets cold..but not when running games

[GhOsTx44]

I got a new pc 3weeks ago and I got this problem since than..my pc shuts down randomly on idle and I found out that it happens only when it gets cold..if I leave it downloading or do nothing it shuts down after an hour or so..but not while playing a game ..now I let a game run in back ground so it can get warm and download all night while I am a sleep with no problem..I really need to solve this issue,please someone help me to fix this

my spec
cpu i3-6100
gpu: msi gtx 970
mb: msi H170a gaming pro
8gb ram

 

[Dark Lord of Tech]

What make and model PSU?

 

[GhOsTx44]

its Sentey Xplus power 725w but I already changed the psu same issue..I guess its the mb that causing me this but I really want to fix it..I forgot to tell you when my pc shuts down it wont start unless I use a dryer to warm a down right spot of the motherboard..I spend days trying to figure out the issue and fix it

 

[Dark Lord of Tech]

Just a quick note , that Sentey PSU is made by Sinyang Electronics , and they are horrible quality and it's really only about a 600w power supply.

 

[GhOsTx44]

yeah I know that and I am getting a new one in few weeks but I need to fix this first

 

[Dark Lord of Tech]

Hard to tell because when the PSU is that poor , I looked it up , has the specs of a 500w to 550 watt , it's not close to 725w it's more like 550w , I over estimated at 600w.

You need decent power to diagnose any further.

Sudden shutdows are usually temp or power related.

 

[GhOsTx44]

but I already tried another psu same thing.

thanks for ur quick reply

 

[GhOsTx44]

btw when it switch off cpu led red everytime then turn on and off infinate loop..it stays on only if I unplug the cpu cord?what does that mean?