i just baught a used spa921. i experience the exact same problem as described here: http://forums.linksysbycisco.com/linksys/board/message?board.id=VoIP_Phones&thread.id=6221
does anyone have a solution for that problem? all i get to see is the welcome-screen. i tried pluging in the ac and out again, the rj45... everything. it just blinks on startup for half a second and that's it.
so that's what my voip-phone looks like at the moment: http://www.voxhub.com/voip/pages/images/products/linksys921_large.jpg ;)