Tell us about your computer... brand and model...
Have you had the case open recently, or in enough vibration of a move that caused the cables to vibrated out of their slots.
Go to Start->Control Panel->System->Hardware->Device Manager and see what is listed with a red, yellow or grey flag... which can sometimes be a clue.
It is not uncommon for an optical drive to fail after heavy use, or after a year, but it is uncommon for both to fail, so either a cable has become unplugged or something else is setup incorrectly.
It would be helpful to know as much as you can tell us about the computer.
Hellish winds, liquid rock clouds and more discovered on this "hot Jupiter"
