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No power to USB ports?


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#1
trigger6114

trigger6114

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Ok, so recently my USB ports seem to have crapped out on me. I can still use a flash drive, and my mouse and keyboard are USB powered, and they work fine. I have an external drive which has a wall outlet, and that works fine. However, I have a new hard drive that is powered through USB, and it doesnt work. The power LED is on, but windows doesn't recognize it. The hard drive works on every other computer. Also, my ipod isn't recognized on my computer anymore, but it works on every other computer. I've tried every USB port available, front and back. I've tried reinstalling drivers, but I got nothing. Then I tried unplugging all peripherals that I dont absolutely need, and I got nothing. I also tried putting a new 800watt PSU in, in case I was suddenly not getting enough power, but that 't didnt work either.

I can't think of anything else that could be wrong, does anyone have any ideas? Thanks a lot
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#2
SRX660

SRX660

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If your external HD uses more than 500 milliamps during startup windows will disable the USB port in order to stop serious hardware damage. What can happen is it works fine when no other USB devices are hooked into the computer. If another USB device is used andthen you try using the external drive then the power allocation gets above the 500Ma causing the port to go dead.

I have a external laptop drive enclosure that uses 2 USB ports to ensure there is enough power to start the drive. What it has is a USB cable that has 2 usb pigtails at one end.

Posted Image

You also might read this website on the subject.

http://articles.tech...11-5055986.html

SRX660
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#3
trigger6114

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thanks for the response. unfortunately that is the exact usb cord that I use, and I still cant get anywhere. I tried switching out power supplies to a much, much larger one, somewhere around 900w, but that still didnt work (mine right now is 500). I'm about to use this as an excuse to get a new mobo, so I guess it's not all bad.
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