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USB Ports give no power

Last response: in Computer Peripherals
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April 26, 2013 12:00:10 PM

I have a desktop that all the USB ports work but only with devices that have their own power. Any non powered device like a mouse, keyboard, or flash drive will not work. Devices like printers and external hard drives that have power will work. Help !

More about : usb ports give power

April 26, 2013 1:50:54 PM

Does that include the USB ports on the back of the computer (that are connected directly to the mb)?
April 26, 2013 2:13:52 PM

^ same question as above.

the usb ports on the back of your pc should work with powered or unpowered devices.

start up your pc and enter the bios. check to see what your usb voltage is listed at. if it is listed at low or medium try maximum.

if a usb device doesnt receive enough power it could be unusable (such as 3.5" external drives with 2 usb plugs when you only plug one in).

if not then you may be able to use a usb pci card for some working usb ports or you can replace the motherboard.

if the back ports work but the front ports do not then it could be an issue with the usb header on the motherboard but most likely is an issue with the case (specifically the cable and usb port area).
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April 26, 2013 4:31:59 PM

jnkweaver said:
Does that include the USB ports on the back of the computer (that are connected directly to the mb)?


All the USB ports both front and back only work with powered devices. Anything that doesn't have power like mouse, keyboard, or flash drive will not work. Interesting part is that I have this computer to a USB KVM switch with another computer. The KVM switch must be only getting power from that other PC because if I shut down that computer then I cant use this one because the KVM switch loses power.
April 26, 2013 5:17:46 PM

i gave you a few options.

i just thought of a few more....

do you have psu cables plugged into every mb power port?

what is your psu rated at and what system components do you have?
April 26, 2013 6:02:17 PM

ssddx said:
i gave you a few options.

i just thought of a few more....

do you have psu cables plugged into every mb power port?

what is your psu rated at and what system components do you have?


Well, The computer is not that old. Maybe just over a year. It is a client of mine so I don't know when it started but it was working when it was new. I don't know what has changed.
April 26, 2013 6:05:52 PM

If the motherboard USB ports don't power than that is most likely a PSU that is too low output for the system.

Answer SSDDX's important questions

do you have psu cables plugged into every mb power port?

what is your psu rated at and what system components do you have?
April 27, 2013 6:48:15 AM

jnkweaver said:
If the motherboard USB ports don't power than that is most likely a PSU that is too low output for the system.

Answer SSDDX's important questions

do you have psu cables plugged into every mb power port?

what is your psu rated at and what system components do you have?


I will have to check. The computer is at a clients that I don't see very often. I'll get back to you.
June 5, 2013 5:55:56 AM

Did you ever find a solution to this problem as i am having this same issue for the past 2 years, cheers
June 5, 2013 6:18:08 AM

did you answer the same questions we posted for him?

with zero info we can provide zero solutions.

try out the ideas we mentioned above and also answer all of the questions and perhaps we can figure it out.
!