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Microsoft Windows 10 (64-bit)

 HP Elitebook 8460p Laptop Shuts Down Unexpectedly.

I own an HP Elitebook 8460p laptop. It keeps shutting down suddenly while I'm using it, without any warning. Sometimes it happens after 30 minutes, and other times it can vary. When it shuts down, the screen goes black, and the fans run for a few seconds before stopping. Sometimes it restarts on its own, and other times it stays off.

To try and fix it, I've replaced the thermal paste and cleaned out all the vents, but the issue continues. I've also reinstalled Windows, but that hasn't helped. I've even tested it without the battery, just using the power adapter, and the problem still occurs. Likewise, running it solely on the battery doesn't solve the issue.

I'm not sure what's causing this problem. Any help would be appreciated

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