Hi all. I have just had to do (above) as the mac showed the powerlight (front) on when not booted (I took supply out, left it for half hour, put back in light came on). I have reset the board & all is ok. I am running an fsck at the moment, but was hoping for any other advice to progress next, for stable G5 & prevention for it happening again (I am guessing power surge). I am planning disk warrior & disk utility for reference. Thanks for your input all.