The cd door is stuck - i cant open the door or...

1. Make sure the drawer-loading belt is still tight and elastic. If not, it can be replaced with a belt obtained from an electronic-parts supplier. The replacement should be of equal or slightly greater thickness and should fit snugly but not so tightly that it strains the motor.
2. Check for broken or loose gears and have them replaced.
3. Check for obvious sources of contamination such as pet hair or foreign objects that are preventing smooth operation of moving parts. Small children have a habit of inserting items into CD players.
4. Use electronics-grade contact cleaner to clean the door-position contacts.