Screen goes black when audio amplifier is turned on.

[ennsn]

Hello,

I have an LG LED monitor, an EVGA GTX 780 Ti (I use an hdmi cable for the display), a Corsair CX750M power supply, and a Microlab FC-361 speaker set. The amplifier for the speakers is next to my monitor. Whenever I turn on the amplifier, the screen goes totally black, but the monitor stays on; and I can still hear sounds or use Alt+F4 or Windows+Right Arrow + Enter to shutdown my computer. The display doesn't come back until I restart the computer. It happens about 60-70% of the time; and it sometimes happens when I turn off the amplifier as well. The amplifier, the monitor and the computer are all plugged into an extension cord with 6 sockets. The cord is connected to the wall via a surge protector. I don't know which part makes the problem, so any help would be appreciated.

Thanks in advance.

 

[sam1275tom]

It might be a interference from the amplifier to the soundcard, my computer have a very short period "no signal" on the monitor sometimes when I switch my Hivi speaker. You can measure this if you have an oscilloscope.

 

[ennsn]

Unfortunately, I don't have an oscilloscope but I will try turning on the speakers when the input cable is not plugged to the back of the computer.

 

[sam1275tom]

Unfortunately, I don't have an oscilloscope but I will try turning on the speakers when the input cable is not plugged to the back of the computer.

Good, please also let me know what happen, thank you.

 

[ennsn]

The screen did not go black when I turned on the speakers with the cable unplugged, however it annoys me to do this everytime. Is there anything I can do like buy a new cable to solve this permanently?

 

[sam1275tom]

The screen did not go black when I turned on the speakers with the cable unplugged, however it annoys me to do this everytime. Is there anything I can do like buy a new cable to solve this permanently?

I don't think a new cable will help since this problem is inside the AMP, I just avoid to switch the speaker power when the computer is on, if I don't want to use it, I turn the volume all the way down.