Philips 42PFL4606H/12 - bought three years ago new, and all fine until yesterday.

Would not turn on, no red light. Disconnected power etc, wait 1 minute then plug back in but no joy.

When power is applied, if I look down the back, there is a blue light comes on for a brief instant, then goes out, but never a red light at the front.

Is this a new PSU required?

And if it is, where can I get one - 715G4546-P02-H20-003E Z-side ?

Thanks

ant