Funny Noise in Monitors

[guitar zero]

Just got the Yamaha HS80M monitors and when I plug them in to the computer (Powerbook G4) I get this loud hiss that intermittently gives a high pitched buzz that sounds like radio interference. I've heard this is common in monitors. Any idea how to get rid of it? Everything is plugged in to a Monster power strip. It makes no difference whether everything else is turned off, it's always there.

 

[ido1957]

The powerbook is not grounded. You get that noise through laptops. Try running on batteries and not the power adapter. That solves my noise problem with my laptop but it limits my recording time.

 

[guitar zero]

That makes sense, I'll try that. Thank you

 

[TexRoadkill]

I hate that aspect of using laptops. I can't believe nobody has come up with a solution for that yet. In my old home office I was able to use my laptop and AC adapter with no buzz at all. I'm guessing the room wasn't grounded so it wasn't an issue.