Question about Acer Aspire 5100 Notebook

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USB Ports dont work!

I have had this lap top for about 2 years, and all of a sudden, anything I plug into the USB ports (there are 3), the computer freezes up and I have to manually restart.

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  • izyman1 Feb 15, 2008

    Where would I find the USB controller? Sorry, im not that computer savvy.

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Try deleting the USB controller in the system properties and rebooting. The system should reinitialize the hardware and reinstall the drivers, which should take place automatically.

Posted on Feb 14, 2008

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In ten years of laptop repair I have seen many foreign objects stuck in USB ports preventing things from being plugged in correctly.

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One of my usb ports won't work properly. If you plug something to it for longer than half an hour the usb port stops recognizing the device you plugged. I have an hp dv7 4190us laptop.


Start with the normal fixing methods, including uninstalling the drivers for your devices and reinstalling them. if That didn't work! Next try System Restore thinking that maybe you have installed something and it caused a conflict with the USB system drivers. That didn't work!

go to Device Manager and uninstall all of the devices under USB Controllers. Restart the computer, reinstall the USB drivers,

You may also see in Device Manager that the device shows up as an "Unknown Devic

last fix for 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.

Jan 10, 2011 | HEWLETT-PACKARD HP Pavilion DV7-4190US

2 Answers

Usb ports not recognized


Did this suddenly start to occur? Were they working before? If so, it is very simple - shut down computer, remove the battery and unplug any power source, wait a couple of minutes and reassemble and power up. Wala! I read all kinds of complicated instructions, started with the simple, and problem solved.

Feb 22, 2010 | PC Laptops

1 Answer

Have 4 USB ports on my compaq R4000 lap top, and only 2 work...


its better that u dont use other 2 usb an use just 2 that works.but try this.
go to bios and load default value and save and restart .

Jun 08, 2009 | HP Compaq Presario R4000 Notebook

1 Answer

USB ports wont recognize anything I plug in


Are you using XP? If so:
Here is what you can do to refresh the USB ports:
1. Right click MY COMPUTER
2. Select PROPERTIES
3. Select HARDWARE
4. Select DEVICE MANAGER
5. Select UNIVERSAL SERIAL BUS CONTROLLERS
6. Right click on each USB CONTROLLER and select Uninstall
7. Uninstall all entries
8. Reboot your computer
9. As your computer re-boots it will reinstall all USB connections it detects
THEN, when all other USB items have been configured and connected by the system, you then should try connecting your USB device.


If I could be of further assistance, let me know. If this helps or solves the issue, please rate it.
Thanks, Joe

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2 of 4 USB Ports Not Functioning


Most likely a motherboard problem, though you can try and re-do windows, best bet on getting it all to work is Turn off CPU, Unplug Power cable, And all usb devices, let it sit for about 20mins. Plug it all back in. Turn on the CPU! Though this might really get on your nerves having to do this multiple times, id get a new motherboard.

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USB Ports on AL27 only work with printer and external hard drive.


I fixed the problem by going to "Device Manager," then to the "Universal Bus". Under "Universal Bus" are a list of the individual USB ports. You have to delete each one individually. When you delete each one, a window opens up which gives you various headers; select "drivers" and hit "uninstall". When you hit "uninstall", windows will ask if you want to proceed. Select "Yes". You'll then get a "warning" that the computer may not work correctly if do this procedure. You want to proceed with the deletion of each Universal Bus port. Once you've removed the Universal Bus ports, then reboot windows. Windows will detect the individual Bus ports and find new drivers for them. Once the drivers are installed (automatically by Windows), the USB ports will be operational.

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1 Answer

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You'll want to verify your computer recognizes your usb ports.
In device manager, look to see that you don't have anything with an exclamation mark, question mark, or red X on it. Make sure you have the usb ports listed under Universal Serial Bus controllers. If nothing shows, your usb ports may be dead. Depends on the age of your computer and what might have happened to them.

Device manager- right-click My Computer and go to properties, then select the hardware tab.

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