plugged in, not charging depending on location

Hi

I have an inspiron ultrabook. When using it at home, i get a message on startup saying that the AC adapter is not recognised. This results in the "plugged in not charging". When using it at work, i have no issues.

The battery has passed a dell diagnostic. All I can think of is that the hardware or drivers don't like my home power supply.

is there a fix for this?

thanks

John