USB PORTS HAVE STTOPED GIVING ANY POWER TO DEVICES.

Try a self-powered USB hub. They're under $20 usually, don't drag down your power supply and give you extra ports to use.

Also open Device Manager, Universal Serial Bus Controllers, each USB Root Hub, and under the Properties, Power Management tab of each one, disable the option to "Allow the computer to turn off this device to save power".

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Ok try to plug it to the USB port at the back of your CPU usually USB port at the back of the CPU supply sufficient power to the device that was plugged in that port so it functions properly cause a USB device plugged to a USB port w/ low or insufficient power supply in that device may cause the device not to work properly that's the reason why your flash drive wasn't recognize by your system. Also that is the reason why you can't view any file in your device.

Ok I experienced this problem before..try to plugged your phone to the other usb port of your laptop try it at the back the power of the usb port there is sufficient to make your device to function properly..I tell you this because some of the usb port except from the back of a pc CPU gives insufficient power to a usb device that can make the usb that was plugged in it not work properly and not recognized by windows.

Merry Christmas!!!

Greetings for the festive seasons!

It seems like you are connecting a USB device to our computer. USB is a PNP bus. whenever you connect anything to USB, some handshaking is done by the OS with your USB device, so as to recognise its class (if it is a storage device or printer etc,) and other details like its manufacturer, capacity etc. If, for any reasons, this handshaking is not done, this error is raised.

to solve this problem, try following things

1. change cord and try again.
2. If it is a USB hard disk, try twin USB cable. where single USB end is connected to the USB hard disk, and twin USB side (both the pins) are connected to the. PC. It happens, when device is consuming more power, so some additional power is needed to drive it.
3. If it is a mobile, printer or camera, install drivers first and then connect the device.
4. If you are connecting it to front USB ports and the wiring inside is made incorrct. This nmay cause damage to any device you connect to that port. if any other product is working on that port, then simply rule out this probability
5.Try different port, as the device you are using may be using higher version (USB 2.0 or USB 3.0). but this is rare case, as PC itself will prompt you by "This device can work faster"
6. Device itself is faulty. try connecting, similar device to your PC and confirm.

If it is not solved, give brief description of what are you connecting to your PC and what have you tried before.

Hi

Please try using one of the USB ports at the back of your computer instead. The problem is that the front USB ports on most computers do not supply enough power, hence they produce problems like you're having where the device is not detected.

If you find using the back USB ports a problem, consider purchasing a powered USB hub. It will plug into your front USB port, and a provided power supply will give it extra power from the mains, allowing the devices you plug into it to have all the power they require.

You are connecting a USB device, right?
Either the device is faulty, or your port has a very sensitive overcurrent protection. If the device works despite of this message, then just ignore it.

If not, does the same device work OK in some other computer?

If so, then you need to try all the USB ports in your computer and see if it will work. If not, then the last resort would be to use a powered USB hub (one with it's own power supply).

If the device doesn't work in another computer either, then it definitely is broken.

Hi, well windows must install the correct Drivers before your device will work. You need to check this.
As the speakers are powered by the USB port and require 5 volts to operate. Some USB ports do not have a full 5 volts DC and have current limiting. Your speakers may require more power then your USB ports can give. or try them with a Powered Hub.
Have you tried them in another computer? to see if they actually work?
Try, another USB port, try a powered hub.
Ensure that they show up in device manager, if there right click, and select upgrade Drivers, allow it to look for and install the generic driver.
make sure it is set as your Default device.
You may have to disable your onboard sound from the BIOS, first too.

The USB device could be drawing more current than the USB port can supply or the USB port may be faulty.
Get a powered USB hub and plug it into your computer's USB port and then plug the USB devices into the powered USB hub.

WinXP SP2 blocks the use of the drive because it thinks it draws too much power. But there is a simple procedure to override this (from WD site):

"Problem:
Under Windows XP, an error message of "Power Surge on Hub Port" or "USB device has exceeded the power limits of it's hub port" is displayed when connecting a USB device to a USB port on a computer or Hub.

Cause:
Under some computers, USB devices are only allowed to draw a maximum of 500 milliamps (mA) per connection from the USB port on the computer system or from a USB hub. Under the Windows XP Operating System, with the release of Service Pack 2, if a device attempts to draw more than this (500 milliamps), a USB port balloon message is displayed to indicate this over current condition. When connecting a USB device that draws power from the USB bus, a very brief over current condition is sometimes detected by the OS, and the warning message is displayed.

Resolution:
This message has no affect on the functionality of the USB port. The USB hard drive should still function correctly on the USB port regardless of the error message. To prevent the USB Power Surge Alert message from displaying, please complete the following steps:
Click on Start.

Click on Control Panel.

Double-click on the System Icon.

Click on the Hardware Tab.

Click on the Device Manager button.

Click on the + next to Universal Serial Bus Controllers to expand the selection.

Right-click and select Properties on any listing that displays USB UNIVERSAL HOST CONTROLLER.

Click on the Advanced Tab.

Check the box that says: Don't tell me about USB errors."

This works fine, and the drive works fine afterwards. I suspect it actually draws less power than they say. Maybe it has a brief power draw spike on startup, but it's running power seems less. In any case, it works fine without the Y cable. I do think it is tacky that WD doesn't give the cable for free, since my $7 Sabrent 2.5" Hard drive enclosure came with a y cable.

But most likely the drive will work fine for you. It is a lovely quiet drive, and takes up no space at all.

If they work without the the expansion unit, the unit is not passing the power through. Many work this way. Some will work with external power.