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I wouldnt believe everything you read on forums.
A model is only made for around 6 months then sold for 6 months after manufacture cease product, by major retailers, due to the speed technology moves on.
Your fault suggests a faulty main board not a faulty DVD drive, you can prove this by opening the unit and disconnecting the cable going to the drive and then starting up the player.
I would imagine your looking at around £150 for repair, I would suggest verifying what is shown on the display when you start it up without the disc drive connected.
Are they all of the same region?
So the unit is switching on and off, but in some instances it stays on and others it will start up but only play selective discs?
This is a new fault, in that the discs were previously working in the player?
I believe your looking at two unconnected faults.
The first is likely to be related to the disc drive not reading the disc properly, which may well be a manufacture design fault but unlikely, and the fix would be to fit a new drive. With regard to it not starting, I believe this to be a faulty PCB.
Please let me know if you require any further assistance.
No problem, do let me know if you have any further questions.