Hi Manny... common problem with the LT's is that after a few years the EHCS can stop working for a number of reasons. I've just repaired my mates one this week, took about 3 hrs to replace the seals and refill with fresh oil... and I've done my own several times.
you'll find lots of info on the K1200LT at bmwlt.com
which is the best forum for it.
The dealers won't touch them, only offering to replace them which is around $1200+
1. If all the electrics appear to be working, can you hear the electric "starter" motor that drives it running? If not it could be that the motor needs replacing... fairly cheap fix to swap over. About $50-$60 to replace the motor, although we have found some cheaper suppliers US$26.60 here
... (same motor)
2. Alternately, the seals that keep the oil behind the hydraulic push rod can deform and release some of the oil, you don't have to lose much oil for it to stop being able to lift the bike... if the rod looks a bit oily that could be the cause. Again, not too hard to fix but a bit fiddly. A gent called John Zeiler on the bmwlt forum has sourced the right replacement seals (in US) and can either send them to you to repair yourself, or he will do a repair for you (for a small fee of course).
3. To get the LT up manually, you really need a helping hand from someone to hold the bike on the other side, hold the stand down with your foot, while pulling back, easier if you run the bike up onto some 2" thick timbers, maybe 6" wide by 18" long.
Easiest method is described here in this thread
about same issue... it also covers a lot of the things to look at.
4. I've made a little video that shows how to remove the entire faulty EHCS unit from the bike so you can work on it once its up on the centrestand. CLICK FOR VIDEO
NOTE: no need to remove any panels... at worst just remove the last 2 screws on bottom right hand panel at rear to make it easier to unplug the electrical connector.
You'll get it fixed without too much drama one way or another... there's a few other funny little things that can make it stop working, but I think we've found them all.