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If your computer's USB ports are working with a mouse and keyboard but not recognizing pen drives or external hard drives (HDD), there could be several reasons for this issue. Here are some troubleshooting steps you can take to identify and potentially resolve the problem:
1. **Check the USB Drive on Another Computer:**
Verify whether the pen drive or HDD is functioning properly by connecting it to another computer. If it works on another computer, the issue may be with your computer's USB ports.
2. **Test Different USB Ports:**
Try plugging the pen drive or HDD into different USB ports on your computer. Sometimes, specific ports may be faulty. If one port doesn't work, try another.
3. **Update USB Drivers:**
Ensure that your USB drivers are up-to-date. You can usually update drivers through the Device Manager on Windows or the System Preferences on macOS. If your operating system is set to automatically update drivers, it should already be taking care of this for you.
4. **Restart Your Computer:**
A simple restart can sometimes resolve USB-related issues. Save your work and restart your computer to see if the USB drives are recognized afterward.
5. **Check for Device Manager Errors:**
Open the Device Manager (on Windows) or System Information (on macOS) and look for any errors or warnings related to USB devices. If there are issues, updating or reinstalling drivers may help.
6. **Check for USB Power Issues:**
Some USB devices, especially external hard drives, may require more power than the USB port can provide. If you're using a USB hub, try connecting the device directly to your computer. Additionally, consider using an externally powered USB hub.
7. **USB Selective Suspend Settings:**
On Windows, USB Selective Suspend can sometimes cause issues with external drives. You can disable this feature in the Power Options settings.
8. **Scan for Malware:**
Run a thorough malware scan on your computer. Malware can sometimes interfere with USB device recognition.
9. **BIOS/UEFI Settings:**
Check your computer's BIOS or UEFI settings to ensure that USB ports are enabled. If there are settings related to USB configuration, make sure they are appropriately configured.
10. **USB Troubleshooter:**
On Windows, you can use the built-in USB troubleshooter to automatically diagnose and fix common USB problems.
11. **Reinstall USB Controllers:**
In the Device Manager, uninstall the USB controllers, and then restart your computer. Windows will reinstall the drivers automatically.
If, after trying these steps, the issue persists, it may indicate a hardware problem with your computer's USB ports. In such cases, you may need to consult with a professional technician or contact the device manufacturer for further assistance.