Power On Self Test (POST) verifies PC components during startup. Q-LEDs on modern motherboards indicate issues with CPU, DRAM, VGA, or boot drive. If your DRAM light is on, try reseating the memory, ...

If your Xbox controller isn't connecting to your PC, it might have low batteries, or it might be trying to connect to the wrong device, like an actual Xbox console, remembering its last connection.

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