Hi and welcome :-)
I don't know if you have this but this may help you out a bit if it's a standard stereo http://www.minipeople.lt/failai/db/4...dio_manual.pdf
Are you trying to play a cd that you have made or a shop bought one ?
I had a problem once with cd's I made in iTunes I think it was the disc it's self I changed the make of disc and have had no problems since.
The other thing is the lazer may be dirty, you can by a cleaner for them something like this CD/DVD Lens/Laser Cleaner with Cleaning Fluid -...
If not may be the stereo is duff if so you have a couple of options
you could put a iPod/iphone retrofit in so you don't need to use the cd or upgrade the stereo or buy a standard replacement from ebay.
If you buy another standard stereo there are two makes of cd one has flat pins on the connector and the other is round so before you buy just check to see what you have.
Anyway just hope it's finger or disc trouble :-) enjoy your new toy be safe