The KsCD application (in Kmenu > Multimedia) is provided for playing CDs. You can not play an audio CD by clicking on the CD-ROM icon on the desktop.
If the CD appears to be playing but you hear no sound, then you need to make sure the CD audio is turned up in the mixer.
If your system products no sound, read "No error message, yet no sound" in this Guide. If other sound plays ok, read on.
To correct your CD audio setting, open Kmix (the speaker icon in the tray at the bottom right of the desktop). Then click on the Mixer button.
Make sure the CD volume (the control with the CD icon) is turned up. Also if there is a little round button (green light) above the slider control, make sure it is on (lighted). The CD control is usually in the Input tab but in some cases it is in the Output tab.