Computer freezes but does not crash (no BSOD)

The computer freezes.
The freezes are random. Sometimes I can leave it running for days with no problems. Sometime is will freeze two or three times in a day.
(NOTE: I leave the computer running 24/7, with a scheduled reboot at 7am every morning)

Symptoms are

1. Screen is on and displaying desktop
2. Mouse frozen (but sensor light is still on)
3. keyboard locked (numlock does not turn off when caps lock is toggled)
4. Clock is frozen (presumably at the time computer froze)
5. The scheduled morning reboot does not occur when computer is frozen (this tells me its unlikely to be the keyboard or mouse)

What I have done to try to regain control
- unplugging and re-plugging in the mouse and keyboard
- plugging in another mouse/keyboard

The only way to get control back is to press the power button and restart the machine

What I have done to try to see what is causing this
- checked the CPU Temperature using CoreTemp. The four cores range in temperature from 27-31°C.
- examined the Event Viewer to see if anything ran at the time of the frozen clock.
- left the task manager open, with the CPU column sorted to show the highest CPU use at the top (trying to see if any task had high CPU use at the time the computer froze)

I will leave CoreTemp running to see if I can catch if there is something hinky next time it freezes.

What I have done to try to prevent this from happening
- Disable the power saving on all USB hubs in teh device manager
- Update all drivers using Winzip Driver Updater
- Used a different mouse and keyboard
- Used a PS2 mouse and keyboard
- disconnected all other USB devices

The important stuff (note this is a different computer from the one in my profile)
HP Compaq 8200 Elite Microtower
Intel(R) Core (TM) i7-2600 CPU @ 3.40GHz
12 GB RAM
HP Bios ver 2.06
Win 10 64 bit OS - ver 1909

Peripherals connected via USB
Canon MX-490 printer/scanner
Microtek Scanmaker i900
Kodak i1220 scanner
AFT- EX-3U internal memeory card reader
Wired USB keyboard and mouse

Thank you for the reply.

The computer came to me second had with Win 10 installed and has been operating just fine until now

I will try downloading and running some hardware stress tests

I didn't know about the driver verifiers so I will check that out (I only updated the drivers after the freezing problem began)

Would it be useful to try reseating the three 4GB ram sticks?

I read somewhere that carefully cleaning the RAM stick contacts with a clean, high quality eraser can help (I have an anti-static wrist strap and some clean air cans). Is this a recommended procedure?

Looks like I have some diagnostics work to do!

There are many computers that have BSOD where the end user has an unexpected restart and does not see (: nor an entry indicating BSOD.
Run each V2 and DM so that the collected files can be scanned for missed BSOD:
BSOD - Posting Instructions

Upload results directly into this thread:
How to Upload and Post Screenshots and Files at Ten Forums

There was another freeze this morning (4:23 am) and the only thing recorded by the Task Manager was that "System" had very high power use at the moment of the freeze. I shut it down and decided this would be a good chance to reseat the RAM, and I noticed a couple of things that that I didn't really take much notice of the first time it did that.

1. The three 4GB sticks of RAM are located in slots 1, 2 and 4. Is that normal/acceptable?


2. They are not all the same

Two are identical - they are Crucial CT51264BA160B.c16fkr, and the odd one out is a Kingston ACR16D3LU1KFG/4G
I have read somewhere that mismatched RAM sticks can cause problems, so I have decided not to put the odd one back in, see how things go without it. This computer is only used for image manipulation and scanning prints, slide and negatives, not very demanding on RAM