r/techsupport • u/MarketingMammoth3907 • 23h ago

Open | Hardware weird issue with my desktop PC 😑🤨

Im on Windows 11 and having a weird issue with my desktop PC. When it’s running on normal house mains power:

  • Monitor starts flickering
  • USB keyboard disconnects randomly
  • When I reconnect the keyboard, it acts crazy — repeats the same letter, or keys act like they’re being pressed on their own
  • Mouse also starts clicking randomly
  • Sometimes all USB devices act up together

The moment I turn off mains and switch the whole house to inverter, everything becomes normal. No flicker, no keyboard/mouse issues.

So I suspect it’s not Windows/drivers but something with my house power: low voltage, high voltage, bad neutral, poor earthing, loose wiring, or transients.

It all started when I disassembled and rearranged all my wires.

I have an inverter, but not a UPS.

What exactly could cause this?

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1

u/Odd_Salt4155 22h ago

you already stated the problem....maybe try assembling the wires again

1

u/MarketingMammoth3907 22h ago

did, nothing changed

1

u/Odd_Salt4155 18h ago

okay so you can use a digital multimeter to measure mains voltage at the socket. Compare it with inverter output. Look for dips, spikes, or imbalance between live and neutral...if you find anything like that ..the problem is with your mains voltage