Disc door will not stay closed

the kill switch is open ensure the lamp cover presses firmly on the kill switch when u close the lamp chamber door the red light will stop blinking and u can now turn the tv on

I experienced the same problem after my tension cables broke. The door fell open with such force that it bent the hinges a little. If you've replaced the tension strings (which you should do every 5-8 years) then you don't have to replace the latch. I did and it didn't solve the problem.
Here's the solution:
Put a towel at the bottom of each side of the door by the hinge.
Push the door closed a couple of times to bend back the hinges.
Remove the towels and you're back in action.
Good luck

The drawer belt may also lift the laser up to meet the CD . If the belt is bad , the CD player will kick out the CD.
Change the belt.
Try studiosoundelectronics.com
or
mcmelectronics.com

take the faceplate off then open and close it,
also make sure there is nothing blocking the door and there are no other discs in the tray.

This fault usually happens if the disc being read is not compatible with the player's firmware.
If discs are burnt from a computer, or copies, this can happen.
Does it do this with all DVD's?
Are you using commercial retail DVD's?
Otherwise something else is telling the player 'No Disk'.
Try a disc-based lens cleaner as laser may be grubby.
Or the laser diode could be defective.

Press OPEN/CLOSE on the DVD player
to open the disc tray.
Press numeric keypad ‘1’ on the
remote control for few seconds.
➜ The DVD blue background screen
will appear on the TV.

Redeem your warranty, this issue happens with the tray is going bad, first this small problem next reading problems

Hello ,

I have a same problem with different Siemens machine. The dispeser door is opened when the signal comes from control unit. Then wax or bimetall endine opens the door. In my case I can close the box after depowering machine . Immediatly after starting cycle box opened again immedialy.
I posetd request and worry it could be control unit.
regards.
Konstantin

changes are good that there is a disc stuck in the dvd player

looks like your switch is jamed or fried, or you installed a modchip incorrectly. If you still are in the return/exchange period, exchange it