Spent the evening troubleshooting this MSI Trident 3 gaming PC that I use with my media centre. Went to power it up this evening and it promptly shut itself off.
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Took it the bench and proceeded to spend a couple hours testing things. On occasion I could get it to boot up to the Windows 11 desktop. I even managed to have it run for about 30 minutes and updated a bunch of Steam games in the process. But then when launching a game, it immediately powered itself off again. System thermals seemed fine with CPU at ~40C and MB at ~35C.
This PC uses an external power brick, a 330W / 19.5V DC supply. Testing with a multimeter and both pins read almost 19.5V on the dot. Power brick barely got warm during testing.
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I suspect the likely culprit is the power brick. There are some generic replacement PSUs from Amazon of questionable quality. The only other viable replacement is a 780W Eurocom power supply that would cost over $700 (CAD) including shipping and taxes.
At this point I'm about ready to give up, but I decide to plug it back into my media centre.
It immediately starts up with no issues. Boots into Windows, able launch a bunch of games, did a bit of performance testing, and even managed to run the Windows 11 updates including reboots with no issues.
I don't get it.
edited:
It seems I spoke to soon. Just tried playing a game for about 20 minutes and it spontaneously shut off again. 😒