only starts up in safe mode

if started up normally, it chimes, the screen comes on with the apple and the spinning wheel. then it goes into a blank blue screen.

However if the shift (safe start-up)key is held down, then it works reasonably, but no sound.

I have done this now,

but 11 items still remain,

repeated many times, and permutations,

still would not repair.

I even found the offending files and replaced them with copies from a working mac, didn't work.

I have photos of the screen, which I have posted on my g-mail account;

http://picasaweb.google.com/lh/photo/cz6...

peter