2001 X5 4.4i

So I drive it home friday night, park in the garage, no problems. Saterday morning it is totaly dead. Not 1 volt in it.

So, put the charger on it at 10a for about 45 min. Open the door, everything seems to be good. Put the key in and it starts right up. But.. Navi is in German, and the dash is dead. No tach or anything. ABS light is on but that is it. And the fuel gauge is bouncing from empty to full. I didn't drive it as I figured it would leave me stranded.

I left it on the charger and took another car. So, my question is...

Anyone ever had a dash totaly turn off?
Any idea how to go from German to English?
Metric to Standard?
Where should I start hunting this power issue..?

Thanks for everyones help. I have used this forum to help me in many things. I am sorry for only bringing up my problems and not sharing my love for my X5 also. I'll be sure to do that soon.

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2001 X5 4.4i Sport
2013 550i Xdrive M Sport
2000 528i E39 (Sold)
Unleashed Air Racing 279 mph Best Average Speed