Hi, The Combo Drive in my iBook is refusing to mount any CD's - I insert the disc, it makes a few quiet noises like it normally does before it mounts the disc and spins up, then ejects the disc after 10-20 seconds. However, DVD's work in the drive with no problems. I figured the lens may be dirty, so I tried to use a lens cleaning disc, but it just spits that out too. I've even tried resetting the PRAM and PMU, but I still have the same problem. Does anyone know what the problem might be?