[header] How to reboot a crashed windows computer [title] Find out the source of the problem. [step] 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 : [substeps] Click the start button, and then click control panel. Click performance and maintenance, then click administrative tools.