When I connect my laptop to a small flat screen with a VGA cable a low buzzing sound comes from my speakers. What do I do?

Bad cable connection maybe? Or bad cable? Or perhaps electrical devices or cables too close?

but how would a vga cable affect the headphone jack???

Try making sure your power cord(s) do not cross any speaker wires, if they must do so at 90 degrees. Also I would suggest plugging your equipment into a surge protector, that should help regulate the flow of power to the devices.

Also make sure your cables that you are using both power, video, and speaker wire are shielded.

I have had a subwoofer that was plugged directly into the wall and it would pick up weird tones from various signals, I guess my house isn’t shielded very well. I plugged it into the surge protector and its all better.

@pikipupiba My guess is that the VGA cable is generating an EM field, which is being picked up by the speakers.

The cables aren’t even close to each other! That can’t be an EM field or interference from the cable. There is NO buzzing when the vga isn’t plugged in.

I don’t know if this applies or not, and I apologize if it doesn’t. We were trying to hook up a camera to the TV using the yellow-white-red cables, and it buzzed horribly when the yellow (video) was connected. Using the s-video cable instead made it usable, and gave a better picture besides. Hope it helps – good luck!