Ded+440n problems

ive had my ded+440n for almost 4 years now and haven't had any problems. i used it often to burn and make movies. just last week, it started having problems. it doesn't show up on my pc. the light in the front just keeps blinking. it wont open up either. nothing happens when i press then button. the drive doesn't even show up as being recognized. it was working fine until one day it just stopped.