Hey guys, mine has been like that since I got my X5 back in Feb.
I did some research and it's not a bulb, it's the lcd ribbon ($30) that
has to be replaced. The ribbon is sold on ebay & there's a DYI on
how to do it. Or, you can send in your whole cluster and they'll
repair it for approx. $200.?
Actually the cluster is very easy to remove (2 screws up top) and
it slides out (no need to remove steering wheel).

bmw x5 cluster pixel repair | eBay

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2002 X5 4.4l Aero Kit & full Dinan Performance
-Strut tower brace
-Dinan Brembo Brakes BBK
-Braided Lines
-Dinan Cold Air Intake
-Dinan MAF
-Exhaust Stainless Steel Dinan
-Stage 4 Engine Performance Software
-Stage 4 Transmission Software
-High Flow intake Manifold
-4.8l 168 wheels
-20's/Toyo ST2
-Bull Bar
-DVD player/ TV, dvd Headrest

2007 Honda Fit Sport
(daily commute)
great on gas.....