most are an easy fix
take the case off the xbox and task out the DVDROM, from there pop off the top of the DVDROM and with a Qtip and some rubbing alcohol clean the lens. let it air dry for a minute or so.
put it all back together and try to read a game.
usuaslly that works bout 80% of the time.
other than that it's easier to replace te DVDROM than changing out the lens of course.
it just depends on how well you are with tiny parts

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