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Oddly enough it seems that the track pad/mouse pointer stops working when the screen is black. e.g. during the time the screen is black the pointer on the screen doesn't move. I thought it might be related to the back light on the keyboard or the touch buttons.

I own a N5110 which was purchased 1.5 yrs ago, which has a Blue Ray drive that was initially working fine but from past 6 months the drive doesn't recognize any disc that is inserted. It makes some kind of noise and comes back with a message stating " No Disc".