Sony RDR GX3 will not power up or allow me to eject disk?

I recently loaded a copied disk borrowed from a friend into the above recorder. The machine would not read the disk or allow me to use any functions title, menu etc and so I pressed the eject button to no avail! I then pressed every button on the remote and on the machine fascia still no response. In a blind panic and obviously having no idea what was wrong or what I was doing I resorted to switching the machine off at the mains hoping that it would re-set itself - this has not worked!
I am now left with a machine that when fed electricity the red led on the power switch illuminates as expected but with no command then sitches to green as if it has been switched on and, bizarrely, immediately as the green led illuminates the machine then says in the dot matrix display power off but remains like that indefinately and never actually switches off. I was wondering if anyone had a similar problem or might know what is wrong as most reputable repairers are looking for £20-£30 to quote for the repair but will deduct that from the cost of the repair if you proceed with the repair. My worry is that the repair may be uneconomic given the age of the machine, 3.5 years, and the comparitively low cost of current better specified machines.