MGS4 FAILURE?!

It was two days ago when i found out my PS3 was not working properly. I was longing to play some Metal Gear Solid 4, so i put in the game and sat down. The menu popped up, and i loaded the game. About a few minutes later, a message popped up saying how it couldnt read my blue ray disc (the game). I tried restarting the tv and the game system but the same problem occured again. I gave up, so i just turned everything off and walked away. When i think back to it, i remember playing the game in the summer time, but my dad probably messed with the settings or something. This ruined my three day long weekend. T.T