key question help!!!!

[bdriven]

First off, thank you guys, and a big to those badmouthing x5's, my 4.4i has 136,000 miles and flies like a MF.......

ok, I bought it used, with one key, I bought a blank, and programmed it according to the instructions found here on x5world, the lock, unlock, and trunklid buttons work flawlessly. Today, I finally got around to getting the key cut. and guess what, it would not turn on the car. then I used the old key to turn it on, and turn it off inmediately. then I tried the new key again, and the car turned on!!! however, after a while, the new key will not turn on. so I still have to carry the old beat up key with me......any ideas on why's doing this???

thanks!!!
Mario.