yep, when it won't go into a gear like that, it usually is a busted up clutch pack.
I am in the EXACT same situation today with my BMW. Was driving home last night, and lost all gears except third. The trans warning light also came on on the dash.
I have no time to look at it, so its at the shop. They are going to look at the electronics, etc. to try to get it going again for a reasonable price, but I think I know what the outcome will be. I'm preparing myself for $2K, so if it comes in for less, I'll be pleasantly surprised!
hey, talk about BMW reliability! The trans went out at 39,000 miles, replaced by the dealer with a factory rebuilt, which lasted from 39,000 to 120,000! Yikes!