Hi guys,

Ive got a bit of a strange problem that I cant seem to fathom out.

Ive got an 18F2455 using the USB and on the breadboard it works fine, plug in a USB to the project and I can read and write the settings etc. but earlier today, I transferred the project onto an etched PCB (checked the PCB for any shorts etc all checked out fine) now here's the problem, it all works as it should BUT whenever I hook it upto the USB windowz comes up with the error saying something like 'theres a problem with the USB divice (sorry cant remember exactly but you'll probably know lol!)

I tried rewiring the USB port, changing the wire I used, even tried ultra short wires and nothing!
I tested the lines with my meter, and sticking one probe onto each pin individually on the USB port and the other on the actual pins of the pic chip and theres no breaks on either track so im at a complete loss!! (GND obviously to the GND line and shows continuity)

Im not using the 5V from the USB, as im using 24v PSU split down to 5V for the logic side etc, but I am obviously using the GND so that the PC and the project are grounded, and the D- D+ are correctly connected too.

So does anyone have any suggestions? I can add a schematic if needed, but everything else is working fine.

Many thanks,

Mark