UPS

My microphone is working properly when my offline UPS is charging! But here is the twist, distortion comes whenever the mains shuts down (yep, we have bad electricity) or whenever the UPS is not connected to the mains (operating on battery). And it won't go away, untill it is getting charged...

I've got a serious problem which I've been noticing since I bought a used Lenovo legion y530 a couple days ago.. Overall it is in perfect condition, no problems.. But don't know why when the power is out and UPS is on (which powers the full house) I see the lights start blinking continuously...

I'm having a Yamaha rx v377 receiver and connected to directly to AC wall socket. I can connect my HDMI out of graphic card to input of receiver and output of receiver to my monitor via HDMI. Usually Monitor and CPU is connected to UPS. So in case of Power failure I'll be loosing my...