This article lists some fixes for the buzzing noise coming from a laptop charger when it is plugged in. Normally, laptop chargers do not make a noise while charging a laptop. However, some users ...

I just bought a Conext (rebadged APC) UPS from CompUSA. It seems to work just fine with my computer and monitor when it runs on the battery (i.e. it keeps them powered), but it makes a loud, ...