Allanc,
Your laptop has a limit on how much power it can supply to USB ports and
there is a limit on the number of root usb hubs. Does your new hardware have
its own supply for the USB ports which it supplies?
Karl


"allanc" wrote:

> I have a 5 year old desktop (XP PRO sp2) with 6 USB ports in total (4
> in back, 2 in front).
> The 4 in back are 2.0 but I am not sure of those in front.
>
> I have not had a USB issue until recently when I changed my monitor to
> one with 4 built-in USB ports.
> I installed the monitor and software according to the directions.
> I connected the USB cable to the back of the computer.
> However, everytime the cable is connected, I am getting errors such as
> 'USB device not recognized'.
> The device manager also shows unknown devices.
> I delete the unknown devices and then try connecting the cable in a
> different order such as before/after monitor is powered up, before/
> after computer is powered up, etc.
> I have also disconnected the power cable to the computer (a suggestion
> from a computer help forum).
>
> The USB cable from monitor to computer is now disconnected.
> All USB devices that were connected at the time the monitor was
> installed function OK (such as keyboard, mouse, printer).
> However, a USB stick that I have used many times now displays an error
> 'USB device not recognized' whenever I connect it.
> I have tried updating the USB driver but a message similiar to 'You
> are already using the current driver' is displayed.
>
> All suggestions are appreciated.
>
> Thank you in advance.
>
>