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When I plug in a USB device it gets NO power.

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INSUFFICIENT POWER - USB PORT
If you get an error message "Insufficient power to operate USB device" when you plug a USB device into the computer's USB port or the un-powered USB hub that is attached to the computer's USB port, then this device is drawing excessive current that the USB port cannot supply. The maximum output from an USB port is 500mA. In case such as this, you need to purchased a powered USB hub and connect this hub into the computer's USB port and then connect the USB device into this powered USB hub.

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If you get an error message "Insufficient power to operate USB device" when you plug a USB device into the computer's USB port or the un-powered USB hub that is attached to the computer's USB port, then this device is drawing excessive current that the USB port cannot supply. The maximum output from an USB port is 500mA. In case such as this, you need to purchased a powered USB hub and connect this hub into the computer's USB port and then connect the USB device into this powered USB hub.

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My book doesn't have power


Did you plug it in?

USB Powered Devices:

If you're using USB for power then you either need a powered USB hub or the device must connect directly to the computer's USB port bypassing the hub.

If the USB hub doesn't plug in to the wall socket then it is not a powered hub. Basic USB hubs do not supply power to devices or charge an external device like a cell phone. The hub must be of the powered variety and plug into the wall before you can use it for things like this.

TIP:
Get two USB hubs, one powered and one not. If you're using a USB hub for anything other than connecting a flash drive or your wireless keyboard and mouse receiver, get a powered one. Doing so allows you to charge multiple devices through USB and it will provide power to other peripherals like a laptop cooling pad, external hard drives, etc.

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I PLUGGED MY MP3 PLAYER INTO MY LAPTOP USB PORT AND IT USED TO WORK NOW IT SAID THE USB DEVICE HAS EXCEEDED ITS POWER LIMITS OF ITS HUB PORT AND WONT WORK NOW


If you get an error message"Insufficient power to operate USB device" when you plug a USB deviceinto the computer's USB port, then this device is drawing excessive currentthat the USB port cannot supply. The maximum output from an USB port is 500mA. In case such as this, youneed to purchased a powered USB hub and connect this hub into the computer'sUSB port and then connect the USB device into this powered USB hub.

Sep 05, 2011 | Computers & Internet

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When plugging my hard drive in my computor tells me that there is a powersurge and the usb port cannot deal with it ? how do I get around this ?


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Anytime I plug something in to the USB port it give a error message that states, Power Surge on the USB port. What can I do to fix this?


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.

Aug 16, 2009 | Dell Dimension 3000 PC Desktop

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USB hub not working?


When you get USB devices, some have their own power, like a plug-in hard drive, and some get their power from the host, like jump drives. My USB scanner gets power from the host, but if you plug it into a USB hub, it sucks the power from the host. Too many of those devices and the scanner fails, so they suggest you don't plug it into a hub.

Here's where the BUS and SELF switch come in. Somewhere, there is a 6v DC power supply that either came with your Belkin or is optional. If you use it, and put the switch on SELF, you don't have to worry about what you plug into the ports. If you don't care, or don't have the power supply, you can put the switch on BUS, but be aware that not all USB devices you plug into the hub will work, or a combination of two devices may not work.

Carl

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Usb ports


  • The driver for the device is faulty. When you plug in a USB device, the computer should load and then configure the device without ever requesting a device driver. If the computer prompts you for a device driver, check the information that came with the device or go to the manufacturer's website to see if a driver is available.
  • The USB port might be defective. If the USB device is connected to a defective port, the device will not work. Try plugging the device into a different port. If all the USB ports are being used, unplug a device that you know works, and then plug the problem device into the port that device was using.
    If the device is plugged into a secondary USB hub with other USB devices, unplug the device from the hub, and then plug the device directly into a port on your computer.
  • Other USB devices might be drawing too much power from the hub. The device you are trying to use might require all the available power or bandwidth that your computer can provide. If other USB devices are connected to the computer and are drawing power from it, the first device might not work. If any other devices are drawing power from the hub, try disconnecting them, and then see if your device works. If this solves the problem, you might want to obtain a USB hub with its own power supply so that you have adequate power for all devices.
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    Usb ports do not active


    One of the great features of USB devices is they can get power from the USB port. Plug in a thumb drive and it just works. The power for operating the thumb drive comes from the USB port. This works for small devices like a thumb drive but not something big like a scanner. The scanner need its own power supply.

    There could be several explinations for what you are seeing. Could be you are plugging in a device which is sucking too much power and the laptop is shutting it down. I would test the port with something small like a thumb drive and see if it works. If the thumb drive works but the other device does not a couple of things could be going on. Maybe the device just need power - is there a way to plug in a power supply? Or maybe the device is broken and shorted out. Does the device work on another computer?

    If something like a thumb drive does not work then it is a problem with the motherboard. Could be the USB ports are bad. It happens and there usually is no easy fix short or replacing the motherboard ($$$). Occasionally there is a BIOS setting for the USB ports. A bit of a long shot but worth a look.

    A possible work around would be to get a power USB hub. A hub plugs into a USB port and provides 4 or 7 USB ports. Good ones come with a power supply. When the hub is plugged into the power supply it does not draw power from the computer. Might solve your problem.

    Good luck!

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