no lights illuminating on instrument cluster and no power to stereo

Hi all,
New here and in need of some help as I've exhausted all of my answers to my problem!!!!
I have a vouge se TD6 2004 and out of nowhere I've a few issues that all came at once so thinking there're linked in someway.
There is no power to the stereo, and when I turn on the lights/indicators/hazard lights the corresponding light does not illuminate on the dash instrument cluster.....however all external lights are working correctly except the two reverse lights!!!
Also when locking and unlocking with the remote key I do not get a flash from the indicators.
I've checked all of the fuses with a multi meter and get a continuity beep from all, and run test 2 on the instrument cluster and all lights came on with no errors coming back.
I love working on my own motors but when it comes to electrical problems I have little knowledge and want to learn more myself so I can have better understanding....and not pay a garage two day's labor just to find the fault.
If anyone has had this issue before or has any ideas where to start testing please help me out.
Thankyou in advance (and I know there is always the drive it up the moors with a petrol can fix but would like to try and fix it first

Being an l322, the latter does appeal
I hope someone can shed so light for you.

Water in the boot left hand side one of the stereo modules.
Mine did it once about a month ago
Messes up the ibus. Stops interior fog warning lights. Indicator warning lights.
External reverse lights.
Also my screen randomly did or didnt come on.

So I've swapped out the reverse bulbs and everything has sprung back to life, I am aware that having a tail light out can cause these symptoms but not a reverse bulb out... anyone known this before or has a previous owner done a bit of a d.i.y hack job?

Shank said:

So I've swapped out the reverse bulbs and everything has sprung back to life, I am aware that having a tail light out can cause these symptoms but not a reverse bulb out... anyone known this before or has a previous owner done a bit of a d.i.y hack job?

Click to expand...

Well done for fixing it and more importantly posting how,many ask for help and don't.