Unable to insert disk into optical drive (MacBook early 2009 model)
I just had this problem with my 17" mbp early 2009.
ODD was blocked like there was disc already in, but of course there wasn't.
Tried many times SMC &amp; PRAM reset and Force shutdown. Sometimes the drive clicked and I managed to insert one disc, which was read just fine.
But after ejecting it, the block was again there.

Then googled some more and typed "drutil eject internal" few times in terminal and all was OK again.