This seems to be a fault in the main board as it fails to switch on. It seems that the power does not switch on as the main processor has some errors that sends feedback to stop it from switching on.
The fault can be related to a short in the drive board, the power to the main board. If the connector to the main board is detached then the display must show up. If not you will need some basisc electronics to check the processor and circuits to confirm if there are any errors.
Also remove the power and allow some time for the set to drain voltages, when switching on press down the play button -- check the manual for the resetting pattern to reset the processor if it has hung up.
The front panel button jamming or other issues like the CD being jammed cannot make the power from coming up and then shutting down. So you will need to have the main board checked for fault. This being a complex area it is better to get opinions and estimate before you tamper to damage the board.
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