A senior computer moment

I had a problem yesterday, so I called Eric, the 11 year old next door, whose bedroom looks like Mission Control and asked him to come over.

Eric 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.'

Eric 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: 

ID10T