Here's a few you can test.
https://www.google.com/search?hl=en&source=hp&ei=0aZIW4_IB8ni_AbdnLGgCA&q=pc+temp+monitor&oq=pc+temp&gs_l=psy-ab.3.0.0l10.6958.10810.0.25322.8.7.0.0.0.0.108.637.6j1.7.0....0...1.1.64.psy-ab..1.7.632.0..0i131k1.0.6qTS6jcAbpw
I have a custom PC connected via HDMI to a TV. When I run the system, sometimes the system will freeze and then give me a blue screen with the case fans all revved up.
I haven't figured out exactly WHEN it does this, but it typically is when I am playing a game. Generally, if I reboot right away, it is likely to occur again soon after. So my thought is that the system is overheating.
I have an AMD Ryzen 5 1600 with stock Wraith Cooler which has had good reviews as far as cooling so I feel like it could be my video card. Is that possible? I have a MSI Radeon R7 250 which is clearly the weak spot as far as performance in my bench mark tests.
How can I accurately test to see what is overheating? (I would need something that tells me the temp but saves it in the event of a crash).
What else could be the issue?

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