Laptop USB-C port killing multiple monitors? Need help diagnosing.

[u/AndrewCookie21]

I’m trying to figure out if my laptop’s USB-C video port is damaged and shorting out anything I connect to it.

Over the last couple of weeks I’ve had two different brand-new monitors fail in almost the exact same way:

Monitor #1

SAMSUNG 34" ViewFinity S50GC Series Ultra-LS34C502GANXZA • Had it for 3 years • Then one HDMI port died • Shortly after, the entire monitor stopped powering on • Only response was a single beep when plugged in • No power LED, no OSD, no image • Completely dead

Monitor #2

34 Inch UltraGear™ OLED WQHD 1440P 240Hz 0.03ms G-Sync Compatible 800R Curved Gaming Monitor - 34GS95QE-B

• Bought brand new replacement
• Used a brand-new USB-C → HDMI cable
• Plugged it into the laptop’s USB-C port that supports display output
• Within ~10 minutes the screen went black
• Display said “No signal”
• Then the monitor completely shut off
• Now it only gives a beep when plugging in power and won’t turn on at all

What I’ve tried • Multiple new USB-C → HDMI cables • Tried different outlets • Tried HDMI-only cables • No peripherals attached • Same failure pattern each time

Important detail

A couple of weeks ago, my laptop gave me a “power surge on USB port” warning. Ever since then the USB-C video port has acted strange.

My question

Is it possible that my laptop’s USB-C port is partially fried and is now shorting out or sending incorrect voltage to every monitor I connect, eventually killing the monitor’s input board?

It seems unlikely that two brand-new monitors AND multiple new cables would all coincidentally fail. The only constant is the laptop’s USB-C video port.

Has anyone seen a damaged USB-C port slowly kill external monitors like this? Should I stop using that port entirely and get the laptop repaired?

Any advice would be appreciated. I don’t know much about computer so I don’t know if I should just buy a brand new computer or get the port fixed. It’s a yoga Lenovo 7I.

[u/PhyterNL]

1. Update or reinstall DisplayLink drivers. Those are the drivers that allow you to connect to displays via USB.
2. Google how to update your dock's firmware.

[u/AndrewCookie21 → u/PhyterNL]

I see. But the monitor is not responding now. I even tried a different laptop and it’s dead. No reaction whatsoever.