~ID Ten 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