Good point newswatcher.
Was half asleep when I posted - not quite up to usual (bad) standard !
But has worked for me a few times.
Yep - earthing is very important when poking about. Make sure you disconnect the mains lead, and touch the metal chassis with one hand before you touch anything else.
Better still wear an earth stap as I always do.
Talking about drive failures I have a question but will start another thread as it's masquerading itself slightly differently.
Cheers