HX2490 Unknown Device

Hi Guys,
I'm hoping someone can help me, because this is driving me mad.
I bought a HX2490 flashed to WM6.1 on eBay, and it's brilliant, except for one fatal flaw ... I can't get a PC to recognise it.
I've tried several machines, with XP and W7, but they all do the same:
As soon as I connect the PDA, I get the "USB device not recognized" error and Device Manager shows it as a USB "Unknown device". I've tried soft reset, hard reset, two different cables, updating drivers on the PCs, reinstalling WMDC on the W7 machine, all to no avail.
Asset viewer Data:
Product Revision level: 1.0
ROM Date: 02/08/08
ROM Revision: 5.20.01.C
OS Version: Windows CE 5.2
Bootstrap Version: 1.00.04
Bootloader Version 5.20.00.H

It's so frustrating, because it's perfect for everything I want, apart from this one problem!

Anybody got any ideas, or suggestions as to where to look?
Thanks in advance,

Brian

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