Scenario:

Client hands me a laptop 8 months ago as it needed to be formatted and re-installed.
Job was done, laptop was delivered, everything fine.

Problem:

Client calls me today for a totally different IT problem. I go there, quote, and while I'm there, client says, "Oh now that you're here, this laptop didn't work since you dropped it off last time. I just kept on forgetting to call you to let you know".

Question:

WTF. 8 months you forgot to call me?

How would you respond to this problem? Would you charge the client AGAIN? What would your response be when he tells you, "I just didn't get round to calling you since you dropped it off to let you know it's still faulty".

Your thoughts please. If any.