One of the more frustrating things that could go wrong is when your PC's screen won't turn on. You may find that your fan is working, but there is nothing on your display, or there is just no signal.

If one of your PCs fails to boot properly -- or is stuck in an endless boot cycle -- accessing Windows and your files may seem impossible. Troubleshooting and repairing a PC that reboots constantly ...

If you are upgrading to OS X Mavericks and get stuck in a boot loop that will not complete the installation, you may need to hit a special key combo to force the computer to complete the installation ...