You didn't plug the stand in whilst the TV was powered up did you? That can cause the motor control module to frazzle..
Turn the TV off at the wall, wait, unplug the stand, turn the TV on, wait, then turn the TV off at the wall, wait, plug the stand in and turn the TV on. Try that.
Check the batteries in your Beo4 too - sounds silly but worth a try.
After that, i'd just leave the TV on standby overnight and try it again n the morning...
Lee
BeoWorld - Everything Bang & Olufsen