Cursitor Doom wrote:

Anyone care to share their experience on the correct approach to
troubleshooting? I'll kick off by suggesting:

1. Assume nothing.

Perhaps we can assemble a list of golden rules....
Well, usually that is a very good rule, and saves time chasing what you
THINK the problem must be, when in fact it is something novel you haven't
seen before.

But, then, I have repaired a few thing recently, where past experience told
me what the most likely failure was, and that was the correct thing to fix.

Jon