Ten T Error

I was having trouble with my computer. So I called Richard,
the 11 year old next door whose bedroom looks like Mission
Control, and asked him to come over.

Richard clicked a couple of buttons and solved the problem.

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.'

Richard 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