If you made a boot disk, use it. Otherwise, get out your system disk and reinstall the system. This time make a boot disk. If it still does not work, take it to the shop. You may need a new disk drive or something more. Something may have worn out or been fried.
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Shut It Off And Then Turn It Back On. If that doesn't work, check the outlet! If it won't turn on after that, maybe dust is clogging things up. Also, make sure your screen is turned on. If all fails, call a computer expert!
That dependws on what you mean by not booting. If you mean not powering up then it may be a power supply. If you mean it almost gets to Windows try booting to Safe Mode and removing Start Up items for a start. I suggest going to the Microsoft Community for more detailed trouble shooting help.(I'm assuming you are using a Windows computer.)