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PC going to sleep every 15 seconds!
I had been putting off the upgrade to Windows 11 but eventually gave in to Microsoft's constant reminders. Install seemed to go OK, but as soon as I started to use it the screen would suddenly black-...
If the problem persists, it could be a compatibility issue with your hardware and Windows 11, or a driver bug. In that case, consider rolling back to Windows 10 temporarily until a fix is released, or consult your PC manufacturer's support for specific guidance.