Does one machine have a USB 1.1 port and the other a 2.0
Is the laptop 2.0 and you've not set up the 18F to deal with 2.0  
correctly?

Try sticking a hub in the middle (I do this a lot during development  
to act as
a isolator of sorts)

Ed

On 4 Jul 2006, at 15:07, palam.c wrote:

> Hi all,
>
> I completed a PIC18F2550 USB board and it worked well
> with my desktop and few more desktops also.
> ** But It is not detected by my acer Laptop. (winxp) **
> Its giving error that 'Unrecognized  USB Device"
> Its a self powered device, i am not drawing any power from
> laptop also.
> How can i debug the issue ?
>
> regards,
> palani.
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