My Samung blu-ray disc drive won't ready any discs. I have tried several blu-rays, DVD's and CD's, but none of them work. I watched a blu-ray movie on it a few hours ago without any problems and now it just won't read any discs. I only bought this disc drive half a month ago, so it is nowhere near the end of its life.

Don't worry. After restarting my computer about 10 times it finally started reading discs again. First person to answer gets 10 points.