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The only discs that a DVD player is guaranteed to read are DVD discs. Support for CD-ROM, CD-R, and CD-RW may be included, but is by no means guaranteed.
CD-R was designed to be read by an infrared 780nm laser. DVD uses a visible red 635nm or 650nm laser, which aren't reflected sufficiently by the organic dye polymers used in CD-R media. As a result, many DVD players can't read CD-R media. Some DVD players come with two lasers so that they can read CD-R.
But as I have already stated that Most DVDs today have the tendency of playing CDs. So if your DVD player is new then it must have that support. Have a look at the quality of your CDs also.
I had similar problem on a Toshiba Satellite A30 laptop, I simply had to reconnect DVD drive. It usually loosing it's connection with motherboard and drive is visible in My Computer but it doesn't recognize any discs. If reconnection does not solve your issue you may try to update your DVD firmware and if it won't help replace DVD drive. Good Luck!
It's likely a laser alignment problem inwhich you will need to replace the hardware. However, I had a similar problem once with a notebook and found out that a tiny bread crumb was near the spindal making the cd in the drive off balance. Check liberally for any debris. Good luck!
It happens in combo drives where the cd reading wont work and still read or burn dvd's or vice versa. If you tried to use a cd cleaner and still didnt work then the cd reader is already busted. it either you replace it a new one or not.