NEED HELP! Getting 'open tray' error!!

First i will say that the morning before the error it played perfectaly. Now 12 hours later I put in Left 4 dead, its says reading then goes to open tray I assume its just some dust for sum ungodly reason and wipe the disk and it sill didnt work. After wiping the disk off multiple times and trying other games it still gave me open tray when the disks had no scratches ecspcially my favorite game Bioshook which had NONE because that is my No.1 game. I put it in and reading.... OPEN TRAY!!!! Now i know sumthing is wrong when i put in 5 different games and none of them are even read when they have no scratches!! I have to ask WTF is wrong with my 360, and how do i fix it. My guess is there is an ungodly amunt of dust on the lens and i just need one of those cans that blow air to get dust of things like ths. Do u know if thatll work or not?? If thats not the case then wats rong with it and how do i fix it??? PLZ HELP!!

Had same problem with my drive a few months ago, bought a new one and replaced it been fine since.

i get that too but the way i fix it is I take the game out of the tray and close it wait till it says open tray again then open it and put the game in and that should fix it. but if that doesnt work then idk