system fails to reboot

[merrygoround]

when i try to turn on my computer, the screen says system fails to reboot, please insert a cd. does that mean my pc crashed?

[Broni]

Please, post your Windows version, EXACT error message, at what point of booting it happens.
Do you have Windows CD, or Recovery CD?
Any recent changes (hardware/software) to your computer?

[merrygoround]

its media center edition, the error message just say "system fails to reboot, please insert window cd" it says that right after i turn on the computer. i havent done any new changes to the computer

[Broni]

Please, post exact error message!
It can not say "reboot", since you are not rebooting, but booting.
What Windows version?
Windows 95, 98, ME, 2000, NT, XP or Vista?