If you shine a torch into the face of the unit can you see anything at all then?.It's possible that the back illumination bulbs have blown.If you still can't see anything,then check all the fuses and if they are OK you need to remove the unit and make sure it is connected up and that you have power to it.
How to recover your renault media-nav system if nav and map are not working when stuck on warning screen. link to recovery zip:renault.welcome.naviex

This is a temporary fix. Unplug the fuse (under the dashboard on the right) for the radio/console display and then put it back (assuming it's OK). The display and column controls should then work. This seems to 'reboot' something, but on my car it's only temporary - the problem returns within a day or two.

When starting my Renault Scenic Meaganne 1.9DCI none of the dashboard display will light up at all, no speedo, fuel, trip computer, clock or indicators. etc Renault say it could be a cluster problem and would cost £400 to supply and fit.

I reset the clock time about 4 times and eventually the dash board lights started to dim and brighten and then the display went completely blank. I managed to get on our ferry (luckily as we were coming home) then rang the RAC who could not fix it and they brought me back on a low loader.
I understand the issue you're facing with your Renault Clio 3 2007, as the radio and the charger point is not working, the following can be the causes of the issue: Faulty wiring harness linked to the radio; Blown fuse; Faulty radio system; To sort the issue out, I suggest you the following steps:
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renault scenic display not working