usb device not recognized

[ecufix]

All of a sudden my laptop does not recognize any of my usb devices such as eprom-programmers and diagnostic devices.
I have reinstalled drivers ect , I did a system restore still not working , how can I test the usb ports on the laptop ?
The devices work on another pc . Please all help needed , regards

[rg66]

If it's Windows read this (http://support.microsoft.com/kb/817900/en-us), and try all 3 methods.

I've had a few comp's where the only way to fix this was to reinstall Windows!

For desktops, sometimes a different power supply does the trick.

[Reapers]

it can be a bit troublesome this sometimes

try shutting down not hibernation or sleep complete shutdown the pc/laptop pull the
power cable out or adapter from laptop for 2-3 mins then

then put the cable/adapter back in and boot up hopefully it should now be useable

if it does not work sometimes another psu works like rg66 said

[Rodbouy]

Try going to device manager when its plugged it and not the usb thats it not working, right click un-install and reboot. Should fix it

[ecufix]

Thanks guys , not quite sure which action solved the problem , only when I rebooted did the usb error clear , thanks for helping , regards

[ecufix]

Discovered that this error was caused by a blackberry being charged via usb

[hypersonic]

With lappies and netbooks sometimes the current and voltage available to drive the USB ports is too low and nothing will work.
If you plug in the charger and they all work then it is a low voltage problem. The moral of the story is don't charge your phone from your lappy

[MrWho]

Get a powered USB hub ... and it should help with low voltage for USB addadons. !

Please >>>> Click Thanks >>>> If I helped you.

[mexanico1971]

I have the same problem in one hp nc6120 , sometimes the usb ports don"t work, or stop to work !
I see voltage usb port, is very irregular 3.60v to 5.02 or more !
I know this is a constant problem in some HP series, but if anyone have one solution for this problem please report!
best regards

[bobbytnt]

Thank you rg66 your soulution helped me out!