PC freezes without explanation,Hard reset required

I'm in need of some help. My PC (refurbed) running Windows 10 freezes when watching video or completing multiple tasks at the same time. I've tried searching the internet for various different ways in which it could be solved, but as of yet, haven't been able to find a solution. The problems started roughly two weeks ago, and every time it crashes, a hard reset is needed for it to be solved.
I've posted some information below, including CPU heat, fan's working etc, all help's appreciated!
Software used to monitor & at time of freezing: CPUID CPU-Z; CPUID HWMonitor; Hard Drive Inspector; Speed Fan; Task Manager; Google Chrome.
PC Specs:
Processor: Intel(R) Xeon(R) CPU 5160 @3.00 GHz
RAM: 8gb
Windows: 10 - 64bit operating system
Graphics Card: AMD Radeon HD 5450
Thanks in advance!

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Clarification Request
Is it random?

Freeze always in the same program, or in any program? What you mean other OS tried but no luck? Meaning it froze in the other OS too, or didn't? You booted this other OS from the hard drive, or a USB drive? (flashdrive?).

"I've re-installed my OS so there's a lot of space on my drive, but still can't find an explanation."

Was this install on top of the previous, or a complete fresh install?

Have you tried booting with only one RAM stick and run it that way for awhile? Then tried it with only the other RAM stick?

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So this is a 2009 PC?

At that age all bets are off if it's the motherboard or something else. Try another OS like Linux to see if it's hardware or software. My bet given the age is it's just an old machine.

We had a recent discussion on an old PC and the member learned a lot about aging in PCs. It's not solid state.

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OS tried

Yeah 2009! I've tried changing to other OS's but no luck. There's nothing in the error logs either which is what I find the strangest.

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It's not strange at all.

Due to aging for example, electrolytic capacitors, 5 years gets like that. Since it's not OS specific that points us back to hardware. Be sure to inspect it all for the BAD CAPS issue but at this age you are into just old issues. This can rankle folk that are used to software issues but since it locks up in other OSes are are again back to hardware.

There are some old tricks I used to eek more time from hardware such as running on a single stick of RAM (slows downs the machine to make less demands on the gear), BIOS speed reductions and cutting the number of cores in say W7 (read )

You also know to pop in a new CMOS battery, just in case. At the office and home I use a Volt meter but I find many folk don't have the basic gear so we just replace it.

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Have you looked at the system event error log?

That's the first place I'd look. Also make sure you have enough space for the paging file to expand.
Good luck.

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No joy

I've looked in the error log and nothing shows up, all it says is windows didn't shut down properly which must be from the hard reset. I've re-installed my OS so there's a lot of space on my drive, but still can't find an explanation.

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(NT) How about drivers? Any ! or ? in Device Manager?

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