TV won't turn back on

Question

I've got a Sony Trinitron color TV (KV-G21S2). It's about ten years old and has never had any problems until now. Last night I turned off the power at the wall socket while the TV was in standby mode. This morning I turned the power back on and when I tried to turn the TV back on it would not turn on. The standby light was not on. I tried to turn the TV on with the remote and also by pressing the button on the set with no success.

The TV was working perfectly before I turned it off last night so I'm very puzzled that it would suddenly stop working.