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HP Compaq 6305 sff random restart problem

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HP Compaq 6305 SFF
Microsoft Windows 10 (64-bit)



I have 30 HP Compaq 6305 sff desktops.
Each of desktop restarts randomly, it does not depend on programs opened.
Monitor goes black, hp logo appears and computer starts booting.
Even computers attached to upses have this problem. No memory dump is recorded.

One of desktops was :
1. Tested with HP PC Hardware Diagnostics, no error was found.
2. Stress tested for about 12 hours - no result
3. BIOS updated
4. Dust were removed from inside the case and PSU.


Did anyone else have this problem with this HP model ?
Or how can I solve it ?



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a starting point would be to look at the windows log files and see if they show any clues


there are numerous websites showing how to read the log files, here's one

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Thank you, maybe someone has more ideas?

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