I assumed (obviously incorrectly) that the monitor hub would be
powered.
The additonal USB ports was actually one of the reasons for choosing
this particular model of monitor.

Thanks to all for their assistance.

On Feb 8, 12:24*pm, Bob I <bire...******.com> wrote:
> Then you are likely exceeding the ability of the port to provide enough
> power for everything you plugged in. Use a powered hub instead.
>
>
>
> allanc wrote:
> > I found out that I can get it to work if I leave at least one other
> > USB device *not* connected to the computer.
> > As soon as I connect that printer, I get an 'unknown device' error on
> > the printer.
>
> > On Feb 7, 10:54 pm, Karl Snooks <KarlSno...@discussions.microsoft.com>
> > wrote:
>
> >>allanc,
> >>The 4-port usb hub on your monitor-does the hub itself receive power from
> >>your computer or from the usb port on your computer? *Here I'm speaking only
> >>of power for the hub itself and not for the monitor.
>
> >>Try, using Device Manager, disabling all usb ports except for the one
> >>feeding the monitor. *If that works, then reenable other usb ports on your
> >>computer one at a time.
>
> >>karl
>
> >>"allanc" wrote:
>
> >>>I am not sure what you are asking me.
> >>>You mean the monitor?
>
> >>>On Feb 7, 10:03 pm, Karl Snooks <KarlSno...@discussions.microsoft.com>
> >>>wrote:
>
> >>>>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.- Hide quoted text -
>
> >>>>- Show quoted text -- Hide quoted text -
>
> >>- Show quoted text -- Hide quoted text -
>
> - Show quoted text -