Unfortunately my brother (Adam_K) is currently unavailable (far away from home). But AFAIK his problems and AmigaMancer's problems are exactly the same. Power supply is OK - about 5,5V on PPC card. Also processor temperature isn't to high. We were trying to set memory access time to 70ns and many other tricks, but they didn't help. And the strangest thing is, that OS3.1 on the same hardware works quite stable.