Original xbox wont read discs

[Onyxthecat]

So, my xbox I got on ebay came in the mail today and it powers up fine but will not read any games I put in it. I opened it and cleaned the lens and still nothing. The inside was pretty dusty. I'm guessing the laser is dead but are there sure ways of knowing if I need a whole new laser assembly? Maybe I didn't clean it enough or properly? All I used was q-tip and isopropyl rubbing alcohol.

EDIT - I just ordered a new laser. Hopefully it works.