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Check all the USB ports to see if they are damaged. If any of the pins in the USB ports are touching the chasis then this will case a short circuit and stop it turning on. With the power disconnected, move the pins away from the chasis using a small ascrew driver and make suer they are not touching each other.
Are you getting a “USB device not recognized” error whenever you plug in a USB mouse, keyboard, or other USB device? I love USB and have 5 ports on my computer so that I can connect my mouse, keyboard, camera, phone, and printer to it all at once! However, last weekend, my computer stopped recognizing my USB devices! The strange thing about it was that the USB ports were not bad because all of my devices were still getting power to them. I could still charge my cell phone without a problem!
So I started with the normal fixing methods, including uninstalling the drivers for my devices and reinstalling them. That didn’t work! Next I tried System Restore thinking that maybe I had installed something and it caused a conflict with the USB system drivers. That didn’t work!
I read online that in order to fix this problem I should go to Device Manager and uninstall all of the devices under USB Controllers. Restarted the computer, reinstalled the USB drivers, but the problem STILL did not go away! You may also see in Device Manager that the device shows up as an “Unknown Device”.
So how did I finally fix the problem? Well, apparently it’s a super simple solution! No need to edit the registry, uninstall drivers, or anything of that sort.
Simply UNPLUG YOUR COMPUTER FROM THE POWER SUPPLY. Yes that’s it! Note that this does not mean just turning off your computer because modern computers don’t really turn off when you press the power button as the motherboard still gets power. First to explain, the motherboard is where all of hardware of the computer is connected to, including the USB ports. Sometimes the motherboard needs to be “rebooted” also because something can go wrong, i.e. all your USB ports suddenly stop working. The small microprocessor on the motherboard will reload the drivers and your USB ports should be back to recognizing all devices! So first turn off your computer using Shut Down or pressing the power button and then UNPLUG it from the wall outlet. Let it sit for about a minute and then plug it back in. Hope this helps someone fix that pesky “USB device not recognized” Windows error!
The USB plug will need to be removed from the computer, if luck is with you the computer will work, if no part is available, use a none powered USB hub on a spare port if available to run your applications.
Make sure that it is the speakers that stopped working by unplugging them from your computer (or whatever you have them plugged into), and plugging headphones into the same jack that the speakers were plugged into.If the headphones work, you have confirmed that the problem is with the speakers.
If the speakers use an AC adapter (black plastic cubical thing that plugs into the wall), then you might try getting a replacement AC adapter with the same output (AC or DC), voltage, polarity (which side is positive, and which is negative), and connector.
If the speakers plugged into a USB port for power, your USB port may have turned itself off. In that case, reboot the computer to see if the USB port will turn back on.
If none of this works, you have to buy new speakers.
Nothing wrong with your USB ports. MagicJack has changed your audio and driver settings so it can use the sound system for phone calls. The changes exist whether the Jack device in plugged in or not. You can confirm the problem by uninstalling MagicJack and reinstalling your sound drivers. Should fix the problem. You'll probably need to contact the maker of the MagicJack device for a workaround. Might be something specific to your laptop/operating system.