ID Ten - T computer error

I was having trouble with my computer, so I called Harold, the computer guy, to come over.
Harold clicked a couple of buttons and solved the problem.  He gave me a bill for a minimum service call. As he was walking away, I called after him, "So, what was wrong?"
He replied, "It was an 'ID Ten T' error."
I didn't want to appear stupid, but nonetheless inquired,  "An 'ID ten T' error? What's that.  In case I need to fix it again?"
Harold grinned...." Haven't you ever heard of an 'ID ten T' error Before?"
"No," I replied.
"Write it down," he said, "and I think you'll figure it out."
So I wrote down. 'I D 1 0 T'

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Tags: Joke