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How to reboot a crashed windows computer
Find out the source of the problem.
Try to figure out what caused the crash. This can sometimes be found by running windows in safe mode then opening windows log files, or if there's a blue screen, you can see the problem written after the memory index (like: ffff01230x230).
To open windows logs, follow these steps : Click the start button, and then click control panel. Click performance and maintenance, then click administrative tools.