Hi guys,
I was having this wierd problem: when moving the mouse in windows, scrolling, reading from HDD, rendering anything with GPU etc... variable high-frequency noise came from my speakers. Not headphones, only speakers. I thought my onboard sound card was dying, so I got new USB sound card, which did not help one iota.
I ruled out problems with drivers: this issue happened even in BIOS. When I was holding any key, it made a noise. Disabling onboard sound or some fancy Gigabyte motherboard features(C1 nad EIST) did not help.
After a lot of painful googling, I tried using cheater cables. After some messing around, I found that disconnecting only my PC from ground solves the problem. Also, connecting PC to power socket with different ground solves the problem.
How is that possible? Common wisdom is that everything should be on the common ground, i.e. common power socket, so that ground loop hum doesn´t happen. What could be wrong here? I´ve got metal case, my PSU is pretty good and connected to MOBO(GA-EP35-DS3) in usual way and mounted on the case with screws that came with case.
I was having this wierd problem: when moving the mouse in windows, scrolling, reading from HDD, rendering anything with GPU etc... variable high-frequency noise came from my speakers. Not headphones, only speakers. I thought my onboard sound card was dying, so I got new USB sound card, which did not help one iota.
I ruled out problems with drivers: this issue happened even in BIOS. When I was holding any key, it made a noise. Disabling onboard sound or some fancy Gigabyte motherboard features(C1 nad EIST) did not help.
After a lot of painful googling, I tried using cheater cables. After some messing around, I found that disconnecting only my PC from ground solves the problem. Also, connecting PC to power socket with different ground solves the problem.
How is that possible? Common wisdom is that everything should be on the common ground, i.e. common power socket, so that ground loop hum doesn´t happen. What could be wrong here? I´ve got metal case, my PSU is pretty good and connected to MOBO(GA-EP35-DS3) in usual way and mounted on the case with screws that came with case.