I have just found this thread, and have been reading it with interest.
I bought a plug from New IT last October (on eBay - it was shipped to me on 9th October 2009, to be exact) and on Sunday (18th April 2010) it gave up the ghost, exhibiting symptoms of the all-too-common power supply issue. I never had it connected to a hard drive without external power, and instead had the sheeva's USB port connected to a powered D-Link USB 4-port hub, to which a powered HDD was attached, as well as a webcam.
I e-mailed New IT, explaining the situation, and they referred me to Globalscale, as per this page (http://www.newit.co.uk/index.php?id=14
) on their website. I subsequently tried e-mailing Globalscale, and, same as the original poster, have received no reply, not even an acknowledgement.
It sounds like chasing Globalscale is a lost cause - does anyone know if there are any other avenues of hope open to me? I feel a little cheated considering I followed all the guidelines, it had very light use, and I believed I was covered by a years guarantee, yet it still died, and now I am being referred to a company who seems to have no intention of answering my e-mails.
Anyone got any ideas?