I'll chime in and note that the last time a computer of mine went south, it was the power supply, as counterintuitive as it seemed to me from the behavior. That diagnosis came from the good folks here, and it was spot on.
-- Bob
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Then the horns kicked in...
...and my shoes began to squeak.
-- Bob
---------
Then the horns kicked in...
...and my shoes began to squeak.