Long shot - but check the on/off switch !! 

You won't be the first avant owner to find "someone" has turned off the avant using the very discrete button - in fact, many people don't even know its there, despite owning the avant for years,

Depending on your Avant, it may be at the back, down near the mains socket, or in a recess under the screen at the front.

This may sound odd, but it isn't that rare for seemingly dead Avants to simply be turned off by accident.  Caused by kids, cleaners,  etc etc.

Failing that - call an engineer.

I know for a fact that sometimes the TV end of the power cord does not fit snuggly into the area at the bottom of the Avant where it goes. Try working the cord while someone else keeps an eye on the standby light. If this does it and you see the light come on, just take a sharp knife and trim around the plug then try sticking it in again. I know this sounds too simple but it happened to me and once the cord was trimmed I've had no problems since.

Last resort call a tech. Not cheap to fix, you pay almost as much as you would for a good used one. It is a shame this stuff is soooo expensive to fix after you've paid for one and then are out of warrenty.

 Good luck,

Dave

How right you are - I'd knocked the on/off switch

She's up and running again.

Many thanks - Superb!!

If only all problems could be solved so easily!

Once again it shows the value of an excellent forum (so thanks to the founders) and the valuable help offerered.

Brian

.....and if I have a catastrophic problem, I just hope it's as easy to fix!!
Well done Dave (King Street)🤒

Andy T.