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How to fix com ports?

The com ports aren't recognized by the device manager. Reinstalling drivers can't find device as a result COM1and LPT1 don't work. viewing the device shown as a? reveals ""Unknown Device". Also, may or may not be associated, plugging anything into any USB PORT locks up the entire unit, key pad, keypad, "CAD" doesn't allow access to the session manager. total lock up.

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6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.
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Posted on Jan 02, 2017

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djnick989
  • 1067 Answers

SOURCE: usb ports do not recognize flash drives

regisrty key maby u could try repairing your windows back it all up redo it maby sum spyware or sumthing if not bad board not powering good engh to usb

Posted on Jan 22, 2008

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  • 1 Answer

SOURCE: "USB Device Not Recognized" - any usb device

is vista sensitive than xp??

Posted on Apr 10, 2008

  • 1 Answer

SOURCE: Compaq Presario v2000 w/ dead USB ports

I have the same problem with my Compaq Presario V2000. Lost both USB ports and HP tells me that the motherboard has to be replaced at $300 +..I searched and found a PCMCIA card with two USB ports for $10. No problems with the USB ports on this card..great and cheap solution.
My belief is that the compaq usb ports do not have power limiting circuitry therefore allowing you to overload the output power on the ports. My ports failed after I downloaded into a burglar alarm system I was programming.

Posted on Jun 24, 2008

mediarich
  • 188 Answers

SOURCE: Usb ports do not work

Try going into device manager and deleting the USB devices, Reboot and let Windows try and reinstall the drivers. If that doesn't fix your problem post that it didn't work and I'll get another message.

Posted on Dec 16, 2008

  • 170 Answers

SOURCE: acer notebook usb not recognized

Sounds like a hardware issue. I would guess that there is a bad connection between the usb's and the motherboard. If you are comfortable dismanteling the laptop and re-soldering the usb's than give that a try, but I would recomend you give it to a pro.
Here is a link that explains the process. http://www.insidemylaptop.com/taking-apart-acer-aspire-5100-laptop/

Posted on Jan 19, 2009

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Laptop not recognizing device when plugged into laptop how to fix


The computer is not recognizing the device because the appropriate software or driver is not installed on the device.

Most of the time when you connect a smartphone into a compatible laptop the device drivers or software automatically install, so the laptop may recognize the smartphone.

Here are some possibilities as to why the device is not recognized.

1) The USB port is bad.
2) The USB port is not activated
3) One of the devices does not support the other

Here are a few possible troubleshooting solutions:

1) Go to the smartphone manufactures website and download and install the updated device driver and software then plug in the device to see if it is recognized.
2) (if Windows OS) Go to the Device Manager to see if the device is showing up when it's plugged in. If you see the device in device manager right click the device and choose to update the driver.
3) (if Windows OS) Additionally, in device manager you can check your device's USB ports to see if there is an issue with the ports that may be resulting in the smartphone not being recognized. You can choose to re-enable the USB ports or update the software for the USB ports.

Hopes that helps resolve your issues.

Open Device Manager Windows Help

Nov 07, 2015 | Acer Computers & Internet

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How to fix ?USB device not recognized? error in windows


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!

c24d32d.png

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”. 42b721d.png
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!



on Jul 08, 2010 | Computers & Internet

1 Answer

Changed the display screen not can't connect to the internet says local and wireless card aren't plugged in


usually the screen has two cables that are connected to the wireless card. you won't get signal if you don't plug those in. however.. it is not recognizing your wireless card. go to device manager and check if the drivers are not installed or if the pc is not recognizing it.

right click on my computer, manage. and on the left device manager.

May 07, 2012 | HP Pavilion ze2000 Notebook

2 Answers

Usb ports not working?


click start control panel administrative tools computer management device manager scroll down universal serial bus controllers you could see a yellow question / exclamation mark? ! or a red X

you will need to update/reinstall drivers

right click to reinstall drivers


if you can see your usb drive but its not working

ports (com&lpt) right click update driver if this fails to fix the problem


check the USB leads that attach to the motherboard usually red white green black make sure they are securely seated and have no dust build up on them dust will cause static and a lot of unforeseen problems to a computer and its parts

hope it helps

Apr 17, 2012 | Dell Inspiron 5100 Laptop

1 Answer

My usb ports aren't working, they are not finding my pen drive even though it lights up


Some pen drives require drivers, if that is the case here go to the pen drive manufacturer's website, for example: SanDisk.com their support section and downlaod the driver you need. if Visa or Windows 7 is your operating system it should automatically search for the correct driver. Also, there are a limited number of devices that you may plug into your usb ports if you overload them you'll get a yellow warning sign in the device manager under Universal Serial Bus controllers. Right click on computer go to properties and look at your device manager you'll see Universal Serial Bus controllers.

Sep 09, 2011 | Toshiba Computers & Internet

2 Answers

Hi, I try to plug my MP3 into one of my USB ports. Doesn't recognize it. 'Removable Disk (H:)' comes up in 'My Computer', but soon disappears.


There is a problem with your USB port
you should try getting them fixed which is a tough job, but you can try plugging your removable media into another USB port like USB ports in backside of the cabinet.
If you don't find any problem with your USB device then you must have been having problem with your Removable Media (Mp3)
If your MP3 Player is under warranty period then you can look for its repair (can be done if its out of warranty too, but it will charge you extra)
Solutions To work around the above issues, one of the below solutions could prove helpful:usb-device-not-recognized.jpg
  • Unsecure or Loose Connection
    Unplug the presently connected USB device (if any). It is quite possible that the connection is not secure and has become loose. Re-plug the USB device tightly and firmly into the USB port. This is one of the most common reasons for an error in detecting a USB device.
  • Scan for Hardware Changes in Device Manager
    Use the Device Manager to scan for new and recently installed hardware. From the Start menu, select the Run option. In the pop up box, type in Devmgmt.msc and then click Ok. From the Action menu, click Scan for hardware changes. This will make Windows scan & recognize any new devices that are installed. Now, close all opened device managers and control panels. Now, follow the above step and see if your computer detects the USB device.
  • USB Power Management
    Disable power management of the USB hub. To disable the power management on the USB hub, follow these steps; Click Start, and then click Run. Type devmgmt.msc in the popup box, and then click Ok. Expand the Universal Serial Bus Controllers' node, and then follow these steps for each USB Root Hub that is listed. 1. Right-click the USB Root Hub and then click Properties.
    2. Click the Power Management tab.
    3. Click to clear the Allow the computer to turn off this device to save power check box, and then click Ok.
    Note: If you perform the following procedure on a laptop computer, you may reduce the battery life.
Sometimes, simply unplugging the USB device and turning off the computer for twenty minutes and then restarting may solve the issue. If none of the above options have solved the problem, check the manufacturer's website for new driver information. It is possible that your drivers need to be updated. There could also be a possibility of hardware failure, which needs to be checked by a hardware expert

Aug 11, 2011 | HP Pavilion Slimline s3407c Desktop,...

1 Answer

My MacBook doesn't recognize my new portable LG Super Multi Drive--GP08 Lite...There's no icon, and things aren't burning...Do I need to download a driver? Why doesn't this product tell...


if your computer came with a motherboard disc the drivers could be on it
click start control panel administrive tools ,computer management ,device manager look through all of your devices if you see a yellow question mark?or exclamation mark ! or red x
right click to reinstall drivers or
if you can see your usb but its not working
ports(com&lpt)right click update driver
just replace the cable of the hard disk, when you plugged the external disk drive you got that windows could recognize the USB device change the cable everything should work fine again, sometimes the wires inside the cable will be damaged due to bending or stretching or placing heavy equipment upon the cable,
check the USB leads that attach to the motherboard usually red-white-green-black make sure they are securely seated and have no dust build up on them dust will cause static and a lot of unforeseen problems
hope this helps

May 25, 2011 | LG SecurDisc 8x External Double-Layer DVD...

1 Answer

I have a Craig mp4 .. but I'm trying to use it but i do not how .. because when i connect it to the computer it is not recognized by the computer please help me


Hi, 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!

usb device not recognized

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".

unknown usb 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!


Have a nice day...

Mar 02, 2011 | Audio Players & Recorders

1 Answer

Onboard USB prrs malfuntion


Try re-installing the motherboard drivers. Here's a link:

http://drivers.softpedia.com/get/BIOS/Asus/Asus-M2V-MX-SE-Bios-0502.shtml


Hope this helps

Chris (ziraffa)

Dec 20, 2008 | ASUS M2N-MX Motherboard

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