For a Lenovo IdeaPad Slim 7i Pro USB-C problem, check charging, USB devices and monitor output separately. Plug the original charger or affected device straight into the laptop. A phone-charging cable may not support video.
Try the same connection in the other USB-C port, then compare a different suitable cable. If charging works but a monitor stays dark, follow the display checks rather than assuming the whole port has failed.
In this guide
1. Confirm the model and the function that stopped
Read the full model code from the laptop label or Lenovo Vantage. 14IHU5, for example, is more useful than just Slim 7. Similar Slim, Pro and Yoga names don't mean every generation has identical ports or charging requirements.
The Yoga Slim 7 Pro 14IHU5 specification lists two Thunderbolt 4 ports supporting data transfer, Power Delivery 3.0 and DisplayPort 1.4. Use that specification only for the matching model, rather than applying it to every Slim 7 laptop.
Write down which function fails: battery charging, a USB drive, a monitor or everything through a dock. Then check whether one port fails or both do. Those details tell you what to try next.
Windows may show Slow charger, USB device not recognized or Display connection might be limited. Write down the exact message you see. Each points toward a different part of the connection, even though all use the same connector shape.
The USB-C notification guide explains these separate cases. Don't treat a slow-charging warning as a reason to reinstall a display driver.
2. Remove the dock and compare the two ports
Remove the hub or dock. Attach the device directly using its suitable cable or adapter, then restart Windows and reconnect it. Look for its normal response: charging status, a File Explorer drive or a picture on the monitor.
Move that same connection to the other USB-C port. Keep the same device and cable. If it works there, the difference points to that port or how it handles the connection. You haven't changed the cable or device at the same time.
Next, compare another suitable cable. For a monitor, choose one rated for the required video or Thunderbolt connection. A USB-C cable supplied just for charging may not carry the video signal your display expects.
If a direct connection works but the dock doesn't, check the dock's power supply and laptop cable. Reconnect the dock with only the essential device attached before adding its other accessories.
I'd make this direct comparison before removing drivers. It's quick, and it keeps a faulty dock cable from sending you into Windows repairs that won't change the connection.
If every direct test still fails, continue with the section for that function. Choose your next check based on what fails: the whole port or just the monitor connection.
3. For no charging, use the laptop's specified adapter
Plug the Lenovo charger into a working outlet and attach its laptop connector directly. Reconnect any detachable adapter cable, then inspect the Windows battery indicator for a charging response.
Use the adapter rating specified for your exact configuration. The 14IHU5 specification includes 65W and 95W USB-C adapter options. Check which one your configuration needs before buying a 65W replacement.
A phone adapter with too little power, or reduced output through a dock, can make charging slow or allow the battery to discharge during use. Compare with the original adapter before deciding that the laptop's charging circuit has failed.
Test the other charging-capable USB-C port for your model. If one consistently charges and the other doesn't with the same original adapter, record that difference for repair support.
Inspect the connector for damage or a plug that won't seat properly. Don't force a loose or damaged port. Charging that starts only when the cable is tilted sideways needs a repair assessment.
For a battery problem that continues with a working port and correct adapter, check the laptop's charging behavior. The battery and the external connection are separate possible causes.
4. For a missing drive, compare another USB device
Attach a known working USB device directly to each port, using a data-capable cable where required. Then try the original device on another computer. The results point toward either the laptop or that particular drive, cable or accessory.
Lenovo recommends direct connections, comparisons and a restart in its USB-device troubleshooting. Some accessories also need more power than the port supplies.
For a device with its own power adapter, connect that adapter. Remove unused USB accessories during the comparison so the laptop isn't powering the whole dock's collection of devices at once.
For an unrecognized device, right-click Start, then choose Device Manager. Find the affected entry, open Properties and read Device status. Record its error code before trying a driver change.
Check supported updates through Lenovo Vantage for your exact laptop model, then restart when requested. Use the package for that model; a Thunderbolt fix intended for a ThinkPad isn't automatically a Slim 7i Pro fix.
If Windows sees the device but File Explorer doesn't show the drive, check the USB recognition and drive symptoms. Don't format a drive just to make it appear when it contains files you need.
5. For no monitor picture, check the video path
Choose the monitor input corresponding to your connected cable. Try a direct USB-C video connection or an appropriate USB-C display adapter, then compare the other laptop port and another compatible cable.
Press Windows + P in Windows 11 or 10. Choose Extend for extra desktop space, or Duplicate to repeat the laptop's picture. A connected monitor can stay unused when Windows sends the desktop only to the laptop display.
If charging and a USB drive work through the port but video doesn't, concentrate on the display cable, adapter and monitor compatibility. Charging and file transfer already work, so you can focus on what the video connection needs.
Update the laptop's supported graphics and connection drivers through the update tools for your exact model. Compare one monitor directly before reconnecting a multi-monitor dock with extra adapters.
A USB-C audio adapter that also fails is another separate case. Most Windows PCs require a digital USB-C audio adapter with built-in hardware that converts the sound, rather than a passive analog adapter.
Ask support to check the port that fails the comparison
If a known compatible charger and device fail directly in both ports after a restart and supported updates, contact Lenovo Support with the model code, Windows version and Device Manager error, if present.
Describe charging, data and video results separately. Ask for a port or power-circuit assessment when the same equipment works on another computer, or when one laptop port fails while the other works reliably.
The Short Version
Compare both ports directly with one suitable cable. Test charging with the original adapter, data with a working device and video with a display-capable connection. Tell support which port and function fail.
Checked November 10, 2026.
