Ok cheers mate, had to add the other bits on my board (asus p5ql/epu) to get it to compile, I'll try the simpler way later.. At least it did work the way I bodged it

EDIT: OK fixed code as you suggested I needed to use 0x830, also got rid of unnecessary bits, sometimes I needed to turn PSU off with 0x430 (before I could restart, shutdown was complete), that seems fixed now. Thanks a lot.