Hello, dear gentlemen.

I have connected a 3.5" HDD to my Xbox360 via USB port. Games install fine and runs them with no problems. But, while the drive is on there are horizontal line running across the screen as if the drive is causing interferences. The lines dissapear if I turn off the drive.

Does anyone have a similar problem and know how to fix it? My guess is it has something to do with the AC adapter.