no pwer to rear entertainment DVD

I am new to this, I have a RR Supercharged Vogue SE 2006.
I have not had it long so dont know anything . I have no power to my Rear Entertainment DVD player. have looked at fuses seem all to be ok

Check all the connectors for the units left hand side of the boot behind the panel for signs of water ingress, but make sure everything is powered down properly first, a squirt of electrical contact cleaner wouldn't go a miss, do not use WD40.

Thankyou for your reply, the previous owner has jammed the cassette disc ( the thing you put the DVD,s in) in the machine, but obviously cant get it out till it powers on.
The mechanic who did my service, spoke about water ingress, and has used WD 40 on all the electrical bits in the boot area. is it going to do harm ?
Will get my lad to go into boot and check wires, will he have to take the machine out ie in bolt it ?

WD40 is not good because it leaves a residue that dirt will cling to, contact cleaner is fast evaporating and leaves connections clean and dry a small brush helps as well, if a remember right the units are all bolted in, and there is a lot in there
we have had loads of threads on here about water in the entertainment area have search you will fit lots of pics.