First post, by Baoran
I have been playing around with a super socket 7 system and I finally tried installing windows xp. In dos everything works fine, but when I go to windows a crackling/buzzing noise starts from the pc speaker. It is a low electrical sounding crackle when I don't do anything but it turns into louder buzzing noise whenever I move my mouse cursor. There is no noise at all when I use dos no matter if I play dos games or do anything else and pc speaker works fine in dos games without any kind of interference.
I have tried everything I can like changing between ps/2 and usb mouse and removing all expansion cards and changing between pci and agp graphics cards but the noise is still there in windows. I even tried disabling pc speaker in device manager.
When I use usb mouse and move mouse cursor the crackling noise just get bit louder instead of turning to buzzing noise like with ps/2 mouse.
Normally I might have thought it could be psu issue, but why it would not happen in dos and I really don't have that many working AT power supplies. The pc is properly connected to grounded outlet.
The crackling noise starts when windows is loading and the "Windows xp professional" logo is on screen.
I would appreciate if you have any ideas how to fix this.