My Thomson Digital TV Recorder 6300-16 has died!!?

When we went away for a few days over Christmas, I turned everything off at the mains, incl. the above. When we returned I tried switching it back on but there is absolutely nothing happening. No lights or anything, despite it working fine beforehand. Have tried different power leads that are known to work and have tried the technique of turning off and pressing the on/off button and U/D/L/R keys etc. Can anyone help or is it destined for the scrap heap??

Many thanks in advance.

KD