xbox 360 won't read any disc and laser jumps from the starting point to...

...about .5cm up and stops reading? like i said, it starts to read the game then the laser only moves up about .5cm the starts jumping around a couple millimeters then completely stops Reading the disc....this only happens on COD4, COD5, and Halo 3 campaign.....should i just buy a new xbox 360? Or is there a way I can fix it myself....its already open w/ no warranty
 
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