Computer Error

I was having trouble with my computer.
So I called Rick the computer guy, to come over.
Rick 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?"

The computer guy 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 out ...... I D 1 0 T