no power?

[radio nut]

I am "trying" to help a coworker with his lcd tv,
it is an rca Model # L37WD12YX1 40 inch set and he believes it is about 4 or 5 years old.
OK, It has been fine until recently and here is what is does;
It started when you hit the power button and it turned on but with a delay it never had originally. But still functioned great
As time went on it came up slower and slower.
Now the power button lights up but that's it......no sound or picture at all.
just the lit power button.
Any ideas? I am into the antique stuff so this will be my first modern set to look at.