My A4000T with CSPPC stopped booting due to the +5V user going too low with everything plugged in. Sometimes it would not boot at all, other times it booted with the mouse not working (as you have said you have seen).
It always booted as long as I removed the keyboard, this sometimes dropped the +5V user voltage below usable when connected. Maybe you could try to boot with no mouse or keyboard also connected.
This seems to occur after I use the DVD drive continuously for a period of time or did many reboots one after the other.
