Hello Everyone, I've just joined and would appreciate your help!

[CKDynamics]

Hi All. I own a Renault Megane Dynamique Cabriolet 1.9 dci - 2005 model which I purchased in 2009 with only 24,000 km on the clock (it was 4 yrs old at the time). One owner I was told.
Last year, 10 years in, the oil filter seal was leaking without our knowledge and the engine ceased. So it was rebuilt at HUGE cost and has been running beautifully since Dec.
However, last night when I got home and switched off the ignition, I went to start it against to move a little forward and noticed I had no dash lights...everything was dead. In investigation I found all the following not working l not functioning,......
#No dash lights or functions at all.
#No indicators.
#No fan
#No interior lights
#No hooter
#No electric windows
#No sunroof function
#Boot won't unlock
Like being trapped in an oven in the 32 deg heat here in SA at the moment!!

And being a Saturday, the Renault Service Department don't work on weekends.
Could it be a fuse?? Loose wire?? Control unit??
Any help would be GREATLY appreciated!
Thanks in advance. Chez