To SeeBee63
There is a known problem with USB cable coming unpluged on the inside of the unit. It happened to mine. And if read on this forum you will read others that have had the same problem. Remove you unit. Remove the cover case and plug the USB cable back in. Give that a try or return your unit. It was Joans (my wife) F900BT but is the same unit.
Yeah, I saw some posts about that last night and I checked it out myself (see Follow up 2 above), with no luck. 
BTW, I really hope I can return it for a refund... I emailed the seller before bidding, since his auction stated "no returns". He assured me it was in perfect operating condition with no scratches, would be packaged properly, all wire leads and harnesses included, v3 installed and the SD update cards included.
When I received it and opened the box (not the original one) which was 6" too large in all six directions, it was just sitting loosely on top of two pieces of styrofoam and two of those packing airbags that have the air chambers in them like little air mattresses. Nothing holding it firmly in place and nothing wrapped around it. The RCA harness, the power/speaker harness, the GPS antenna and the Bluetooth harnesses leads were also just rolling around in this box with the unit. By the look of the dings on the inside of the box it looked like it flopped around quite a bit on it's 900 mile journey from Illinois to Toronto. Upon taking inventory I found it was missing the iPod cable, the reverse sensor lead, the VSS lead and the v3 software update SD cards. Due to the bad packing, the front of the unit is now scratched and nicked in various places, and as is obvious from this thread, the iPod connectivity does not work with this unit.
Upon contacting the seller, he said everything was in there and it was packaged up properly when he sent it. He thinks US Customs opened it and stole the missing items out of it and removed all of the packaging materials he had used when he packed it up. He thinks this because he's "also in law enforcement". 
Yeah, right! US Customs took three virtually useless (to them) cables and software update cards, removed packing materials from the box, but left the $500 nav unit!?!? 
He also thinks I should be making a claim to USPS for these problems, but I repeatedly told him that only the shipper/seller can initiate the claim. In our communications with eBay the guy has even tried to say that I'm trying to scam him out of more money! I don't want more money –– I just want a F90BT that works!
This guy is an idiot and I really hope that the eBay/PayPal resolution office doesn't side with him, but I've heard of them messing up obvious claims before.
Sorry for the rant but I have over 10 years buying and selling on eBay with perfect 100% feedback whereas this douchebag I'm dealing with is less than perfect and even had a negative feedback yesterday stating "Misleading product description" from a buyer. I'd post his eBay username if I thought it wouldn't cause any problems... maybe I will once this issue is settled. 