As my I-Drive screen did not boot up every 20 starts or so, I actually deleted pairing and re-paired my phone. It only happens once every 200 start ups or so. There is a TIS on this (The following was copied from cobradav at the forums.e60.net board) Frequently reported issue in BMW TIS. SI B 84 16 07.

When iDrive is not working properly, however, it can be a real complex and expensive headache to fix. If the BMW iDrive is not turning on, updating the iDrive software, replacing a fuse or rebooting the iDrive system may resolve the problem. Sometimes, the problem can be due to a system malfunction and these simple solutions will help to solve

We can professionally repair your BMW CCC Professional idrive for E60 (5 series) and E61 (5 Series Estate), E63 (6 Series), E90 (3 Series), E87 (1 Series) and similar models from 2004 upto 2007 (pre LCI) and restore it back to original working state. As the original unit is being repaired, all your existing data settings will remain intact
This is a short video about the screen not working on a BMW E60.#bmwe60 #bmw #bmwlcd
The Power comes from the MULF2. The USB/AUX port itself has had a couple of part number changes. Seems like its likely to fail, hence the need to test continuity. If that checks out, your USB port is probably the issue. 1999 Alpine White BMW Z3 Roadster 2.5 Manual - Daily Driven Project Car. 2007 BMW 550i - Sold.
It does not seem to be the same as the described iDrive problems that show a blank screen. Specifically, on my 2008 528xi, when I start the car, the iDrive display is stuck on the home screen and nothing moves it. The bottom line of the display shows the radio station currently selected but blank time and date (dashes for both).
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bmw e60 idrive not working