Been trying to find the battery drain problem and now I have radio/nav system weirdness. The screen stays dark flashing once in a while. The radio will make sound for a minute or so then stop all together. Tried reseting by disconnecting the battery. Checked all the back fuses. Have not checked all the front fuses yet, plan to do that tomorrow.

Any clues on what to check?

2002 X5 4.4i