playstation 2?

hi, i just got a used ps 2 (for 20 bucks)i knew it was broke!i fixed the problem with the door closing and opening at will.i replaced the power and rest buttons from another ps2.but now my other problem is it wont spin the cds at all!can someone please help!! ps i had another ps2 ,that was spinning fine but after i took it apart to clean laser and such it stopped spinng?the ribbons on this one all appear to be attached,thanks