Is it a CD-ROM or DVD-ROM?

If it is a DVD rom, can you run other cd-s or just dvd-s?

If you can run just dvd-s and not cd-s that it is probeobly wrong region set on dvd-rom or atapi cabel is damaged...

I can help you with region change if what I sad is correct, but DO NOT change regoin by yourself if you don't know what you are doing, since you have only 4 tries to change the region, after that you can't change it anymore, not even if you plug your dvd-rom in another computer!