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HP Recommended
HP All-in-One - 22-b020na (ENERGY STAR)
Microsoft Windows 10 (64-bit)

HP All-in-One - 22-b020na - from cold boots up normally into Windows 10 (21H2) and runs for a 10-15 minutes before failing catastrophically as if the power has been removed, although the the power LED is still lit (and I've tried two different PSUs). Black screen, no cursor, no activity. Opened unit and reseated memory and hard drive cables, there doesn't seem to be much else in there to fiddle with. Processor fan is operating quietly and apparently efficiently when powered up. Bizarrely, when run with the All-In-One opened up into its two clam-shelled halves, the wretched thing seems to work indefinitely, but on putting it back together the issue returned. 

 

I don't remember seeing a failure like this before that wasn't a PSU: is there a thermal cutout on the motherboard that might be faulty or something, perhaps? Once it has failed, it will not restart until 15-20 minutes with the PSU removed, then boots as normal and fails again as above.

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