Every 1 to 5 minutes my screen transiently dims and then restores as if there is a power interruption. There is an associated beep..

Every 1 to 5 minutes my screen transiently dims and then restores as if there is a power interruption. There is an associated beep. It's as if there is a power transient in the video circuit. Anything I can do?

That's a brownout, where you don't have enough electricity going to the device.
It usually occurs with bad wiring, or a heavy device like a AC or refrigerator unit kicking on the compressor which draws a lot of current.
You need to reduce the electrical load on the power lines your using, if you don't know, call in a electician to take a look and calculate your load.
It's a potential fire hazzard too when there is a big spike like that, electrical fires start that way.
Use your device someplace else with good power and see if it continues. Then you know it's a hardware problem.

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