Well,
I've had lots of problems with my A1200/060/BVision in the desktop. But I've managed to solve them all. The problems started when I added a PCMCIA wireless card. The system was very unstable and crashed or hanged all the time. Swapping resolutions too.
Eventhough someone mentioned that 200W powersupply is enough, I had a 200W power supply. But this turned out to be the problem anyway. Perhaps the maximum power output was less than 200W due to the age it was but all problems were solved when I finally connected a brand new 400W powersupply to my machine. Now it runs like a rock. So perhaps you should try it anyway?