Tech support: The invisible printer

Back in the early noughties I had a client - let’s call him Nigel - who supplied computers to estate agents across the UK.

One day a call came in:
“This printer you’ve sent us is printing invisible.”

The client wasn’t far from Nigel’s office, so he went over to take a look.

After a very quick inspection, Nigel said:
“Oh, this is embarrassing. We also supply MI5 - we’ve accidentally sent you one of their printers that uses invisible ink.”

He took the printer out to his car, removed the tape from the print cartridge, then brought it back in as a “replacement”.

Problem solved.