Brushless Lst2 Problems

i checked voltage on my lipo pack 15.12 vdc, now there is that light on steady even if I shut the switch off on the esc. I turn it back on it makes the normal beep and will just turn the motor maybe a 1/8 of a turn and nothing, when I return the throttle to nuetral it beeps like I am just turning it on. (light is steady on all thru this sequence). It was running pretty good before this at 90% epa but now it will do nothing!!!!!!