Need help with random reboot

[copracr]

Hi, I upgraded my mobo from a 770t to a new GA-970a-us3p. Ever since then I've been getting reboots when I play a video or netflix. I've tried:
prime95 stress test with no problems,
memtest with no problems
updated the drivers
updated the bios to fb
replaced the video card and power supply (I wanted to do that anyways)
re-seated cpu and memory
updated from win 7 to 10
disable the audio from bios with no change

I'm thinking I'm looking at a bad board, but if someone could walk me through diagnosing it on Windows 10 I feel like it would be a valuable skill. I haven't used 10 much and this should be a good way for me to get familiar with it (I was comfortable on XP, not so much vista or 7).

Time to update my skills, any help is appreciated.

 

[Greg Gregorich]

may help monitor hardware temperatures.

 

[copracr]

I ised HWmonitor while I ran those tests and the cpu is maxing at about 62 and the other thing that looked a little hot was the tmpin1 at 72.

Since I posted this I also ran Furmark for about an hour without issue and the gpu temps were about 60.

About an hour after running furmark I put on netflix and it restarted within 5 minutes.

I'm at a loss, I can run all these stress tests without any errors but 5 minutes of netflix or windows media player and it crashes.