Unfortunately your HD might be dead. Ours was starting to act up a few months ago doing the same thing (sluggish control responses) fortunately we caught it in time and were able to copy the hard drive. The pendant link alarm is odd, usually one of the connectors inside the pendant comes loose and you'll get this alarm, this might be a secondary problem. Not sure what the M11 breaker is for.
So when you turn on the machine you get nothing on the screen at all? Seems odd, since you should see the bios screen at least, followed by a "no operating system" or similar message.
If you dont see anything on the screen at all, than you might have other problems.