X5 4.8i (blank screen) WEIRD ISSUES!

[PlatinumX5707]

So I'm new to the X5 world.. Beautiful trucks!!

Just picked up a used 2008 with 108K. 4.8i Been a BMW guy my whole life. Actually own 3 others. (see signature)

So I've been lurking on the forums now for a few weeks trying to find information regarding my issues. Here's what's going on.

Bought the truck from a used car dealer. no warranty as is. Dealer did tell me they had issues with the NAV not working. More importantly the CID unit. I had the dealer discount the truck close to $3k due to this issue. Paid $7500.00! truck is immaculate. Pictures coming next thread!

Here's what I've done so far.
1. replaced the CCC unit with another one.
2. Have had SFBMWCODING (Adrian) re code the new unit to the truck. He got the "chime" back, backup and front sensors to "beep beep"
3. replaced and checked all fuses in the trunk (right side rear compartment)
4. replaced and checked all fuses on passenger side lower glove box
5. Removed the IDRIVE knob completely and taken it apart to check for any burnt area's and such. SPOTLESS
6. Replaced to a new battery.
7. Done a 30 min and over night battery reset.
8. Swapped back the original CCC unit (just to double check)
9. Did the "hold volume & eject buttons test several times.
10. Completely unplugged all components on left rear compartment (when disconnecting battery)

Weird stuff -

1. AUX works with my phone. If I push the "mode" bottom I can get lucky and find the setting for my Pandora to kick off and play.
2. HAVE sound in front speakers
3. Backup and front sensors work
4. DVD and CD drive take a CD

I'm stuck and out of idea's.

I'm coming to a conclusion that maybe its just the CID screen? I can take a 3 hour drive an buy a used unit from BMW Recycler in Sacramento but that's almost a $300 day.

Any idea's and suggestions would be grateful!