1) Check whether the power supply is coming to the disc drive.. i.e you will be having some small light.. is it blinking? If not, then there is something to do with the powersupply to your CD drive.
It is blinking
2) If its(power to drive) working, then definitely, it has to be some small problem. See, if you can spot a small hole(very tiny) hole next to eject button? Some drives have this for emergency purpose like this.. Prick it with a pin, the CD holder will come out
I tried this and it did not work
3) Best thing is to, call for someone who knows handling hardwares well( probably a technician) and ask him to verify it.
That is my next step. I have a friend who really knows how computers work who should hopefully sort it out