I've had issues with the 2.5 scheduler as well. Sometimes when it changes from one sequence to another, the lights would just stop, but the audio continued to play. Also I've noticed on some sequences, that the amount of memory that LSP increases as they are played back in the scheduler, once they get to about 1.3 to 1.4 Gig, LSP frees up/flushes the memory back down to 900M, during that free up/flush process the Audio burps (the audio comes out as garbled), after LSP has done this (it takes about 1/2 second the audio playback goes back to normal).
Ive report this bug to the developers.
Is that what your heard that you describe as girgling?
Not sure why your computer won't start up