Hello all! I recently bought Logitech's z506 surround sound speakers for my pc. After installing them i noticed every once in a while when my speakers where doing little to no sound output, they would make a beeping, buzzing, ringing, altogether annoying noises. So i returned them and exchanged them for a new one. Now I'm finding that the new ones are doing the exact same thing! I think i know what it is, my pc. Because every time it is thinking about something the speakers buzz. I don't have a sound card, just the one in the motherboard. My old stereo speakers Didn't do this, but these are. For the price i payed i want them to work well. Please, if anyone has this problem or knows any helpful info, please help. Thanks all.