Hello,
New to the forum and what a great place to find
I have a range rover sport 2007 3l tdv8 model and lets say its been playing up of late.
Prior to christmas needed a 3k replacement turbo

And today got into the car after a valet and lets say my sat nav dont work the screen dont work,the radio has no sound but had a power light....
No cd sound nothing and the sat nav screen dont even come on?

Any ideas?

I read somewhere that the valet may have messed up the becm? does that ring a bell at all?

I had my Audi A6 valeted years ago and I noticed a small amount of white fluid around the buttons on the MMI after ringing the valeter he admitted he had spilt shampoo on it, the whole thing was kaput £900 for a new one, agreed £600 cash from the valeter as my company paid for the fix.

Hopefully it's something less permanent for yourself

Get your battery & alternator checked out, these items are common problems.

As Ady says - test the battery. If the valet chap has left the doors open for along time and the battery was marginal already e.g. original battery on its last legs, then it may now be beyond help. Poor battery condition and/or failing alternator can cause a number of odd errors/failures. 2012 SDV6 - it's missing a couple of cylinders
2008 TDV8 - it was a labour of love and is much missed