Hi All-
I set up my A4000 and just let it run for a few years, playing freecell every time I walked by. Finally it started to crash more and more often. If I let it cool off it would run again for a while, leading me to think I had a cooling problem. I took it apart and found that a mouse had got in to the power supply (a warm place in a cold climate) and built a nest and packed it with stored food. Cleaned it up and it has been running fine since (over a year). Robust machine.
CRL