How to Fix USB Device Not Recognized in Windows. Are you getting a “USB device not recognized” error whenever you plug in a USB mouse, keyboard, camera, or other device? I can’t live without USB ports and currently have 5 ports on my computer so that I can connect my mouse, keyboard, camera, phone, and printer to it all at once! For those of you with even more USB gadgets, you probably have connected a USB hub to one of your USB ports so that can you connect even more devices. Most of the time this works great, but occasionally your computer might stop recognizing USB devices. Adapt a USB-A device to a USB Type-C port on a laptop, desktop computer, tablet, or other device. Short for Universal Serial Bus, an external bus standard that supports data transfer rates of 12 Mbps. A single USB port can be used to connect up to 127 peripheral. The serial port is a way to send data between the BeagleBone Black and another device. Establishing a serial communication between your computer and your BeagleBone. Instant, No Hassle Connections. Universal Serial Bus (USB) connects more than computers and peripherals. It has the power to connect you with a whole new world of PC. The odd thing about this error is that the ports are working just fine, as I was able to still charge my cell phone without a problem, but couldn’t get my camera recognized using the same port. After spending a lot of time and trying a bunch of different ways to fix the problem, only one solution ended up working for me. Installation procedures. Connect the USB to Parallel adapter to your windows XP computer. You should hear a audible sound that new hardware has been found along. The RocketPort® USB Serial Hub III is a USB-attached 8-port serial expansion device for PC-based servers and client computers. Delivering eight RS-232 ports, the. I’ll mention that solution first, but will also mention the other possible solutions, as the first solution may not fix the problem for everyone. Method 1 – Unplug Computer. So how did I finally fix the problem? Well, if you are lucky, it’s a super simple solution! Try this method first and if it works, you’ll have saved a lot of time. Simply unplug your computer from the power supply. Yes that is it! Note that this does not mean just turning off your computer using the power button because most modern computers don’t actually turn off completely and the motherboard will still get power. This is useful sometimes if you want to remotely wake up a computer, etc. The motherboard is where all of hardware of the computer connects to, including the USB ports. Sometimes the motherboard needs to be “rebooted” because things can go wrong, i. The small microprocessor on the motherboard will reload the drivers and your USB ports should hopefully be recognizing devices again. ![]() USB to Serial Converter -, Connects One Serial Device to a USB Port, Prolific PL-2303RA Chip, 45 cm (18 in.). USB is supported at the operating system level. Compared to alternative ports such as parallel or serial, USB is very user-friendly. So first turn off your computer using the Shut Down option in Windows or pressing the power button and then UNPLUG the PC from the wall outlet. Let it sit for several minutes and then plug it back in. Method 2 – Update Device Driver. If Windows is not able to recognize the device, you may also see in Device Manager that the device shows up as an “Unknown Device”. You can get to Device Manager by clicking on Start and typing in devmgmt. Control Panel and clicking on Device Manager. In that case, you should right- click on Unknown Device, click on Properties, then the Driver tab and then click Update Driver. If this doesn’t work, you can also try to download the driver for your device from the manufacturer’s website. If the USB device is just a flash drive, then it’s probably not a driver issue. However, if you are installing a USB printer, drawing pad, etc, then it might be worth downloading the driver for that specific device. Method 3 – Restart & Disconnect USB Devices. The next thing you can try is to disconnect all USB devices and then restart the machine. If the device is recognized by a different USB port, there could be a hardware problem with one of the USB ports. If no USB port recognizes the device, then keep reading because it’s probably something else. Method 4 – USB Root Hub. Another thing you can try is to open Device Manager, expand USB Serial Bus Controllers, right- click on USB Root Hub and then click on Properties. Click on the Power Management tab and uncheck the Allow the computer to turn off this device to save power box. If you have more than one USB Root Hub listed, you need to repeat these steps for each one. Click OK and then restart your computer. Try to reconnect the USB device and see if it is recognized. If not, go back to the power management tab for each one and check the box again. If it does recognize the device, then leave them unchecked. Method 5 – Connect Directly to PCA friend of mine ran into this issue and the cause ended up being his USB hub. He only had three USB ports on his computer, so he bought a hub where he could connect an additional 8 USB devices. I guess this proved too much for his computer and it just started sporadically not recognizing various devices. After removing the hub and connecting the device directly to the computer, it worked just fine. We haven’t really been able to find any other solution to this problem other than reducing the number of items connected to the hub. Actually, one other solution worked, but it meant having to buy a new USB hub with more power. If you are having this problem with Windows 8 or Windows 8. Microsoft has released a fix for Windows 8 not detecting USB devices properly. Make sure to install this hotfix if running Windows 8. Method 6 – USB Troubleshooter. If nothing has worked so far, you can download the Windows USB Troubleshooter Fixit tool. It’s a free tool that works with Windows XP, Vista and 7. You can either have the troubleshooter fix the problems for you or select the fixes yourself. I would just let it fix them for you since the choices can sometimes be confusing and technical for the novice user. Method 7 – Update Generic USB Hub. If you are getting the Unknown Device error in Device Manager, you can also try one other thing. Open Device Manager and then expand Universal Serial Bus Controllers. You should see at least one item called Generic USB Hub. On some computers, you might see two, three or more of these. Right- click on the first one and choose Update Driver Software. When the update dialog pops up, choose Browse my computer for driver software. Then click on Let me pick from a list of device drivers on my computer at the bottom. From the list, select Generic USB Hub. Normally, there won’t be anything else listed except for that one choice. Click Next and then click Close once it finishes installing it. At this point, the Device Manager screen should refresh and either the unknown device will still be there or it may now be recognized. If it’s still showing as not recognized, then you repeat the process for each Generic USB Hub listed. Method 8 – Uninstall USB Devices. As a last resort, you can also try uninstalling all USB devices from your system and then restarting. I mention this last because even though Windows is supposed to automatically recognize the USB controllers, hubs and devices automatically, it can sometimes fail and you’ll end up with no USB ports working. I had a computer with 6 USB ports and only one port would not work properly. I uninstalled everything under USB Serial Bus Controllers in Device Manager and restarted. Instead of re- detecting everything, I was left with no USB port working, so be careful when using this method. Go to Device Manager and start uninstalling each item from under USB Serial Bus Controllers. Before you start with anything that is already working, uninstall the items with exclamation points or that are listed as Unknown Device. Method 9 – Uninstall Hidden Devices. By default, Device Manager doesn’t show all devices that have been installed to the system. It basically only shows the ones that are currently connected. However, if you installed a USB printer earlier and now no longer use it, it will still be installed, but won’t show up in Device Manager. Certain hidden or ghost USB devices can cause conflicts with current USB devices and therefore lead to this error. You can view hidden devices in Device Manager by first opening a command prompt and then typing the following two commands: set DEVMGR. If you see anything listed there that is greyed out or that says unknown device, go ahead and right- click on them and choose Uninstall. Hopefully, removing the older devices will allow the newer devices to work properly. Other Possible Solutions. If nothing has worked until this point, it’s pretty safe to say there could be a problem with the actual hardware. The best thing to do is to connect the device to another computer and see if it works or not. If not, then it’s definitely an issue with the device. Possible Solution #1 – The other possible solutions are to try a different USB cable, if you have one lying around.
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