Rebooting a computer is done by restarting it. There are a several different ways to reboot a computer. You may also want to reboot a computer into safe mode or use a system CD to troubleshoot any problems you are having.
Click "Start," then "Restart."
Press "Ctrl-Alt-Delete" simultaneously. Then select the "Restart" option.
Press and hold the computer's power key. Most systems will power down after about five seconds. Because this method will force a hard power-down, which does not give hardware or software any warning that power is about to be cut, data can be lost. For this reason, a hard power-down should only be performed if other efforts to restart the computer do not work.
Unplug your computer and plug it back in. Turn the computer back on. This will also force a hard power-down, so you should only do it if other methods did not work.
Shut down your computer. Wait 30 seconds.
Turn your computer back on. Immediately press and hold the "F8" key.
When the "Advanced Boot Options" screen appears, select "Safe Mode" using the arrow keys on your computer and hit "Enter."
Place a bootable system CD or DVD into the disc drive.
Restart your computer.
When prompted, hit any key to boot the computer using the disc.
Contact your computer's manufacturer if this does not work, and you are sure the CD or DVD is good. Your computer may not be set up correctly and various troubleshooting methods are required to figure out what is not working.