Posted: 15/06/2012 at 22:25
The main stems should have woken up by now, but don't despair. Leave them in situ. Raspberries are extremely vigorous and will grow new shoots up to four foot from parent plant, so unless your specimen is completely dodo, you may yet get new growth from the roots.
Monty says that Raspberries are shallow rooted and don't like competition from weeds but mine grew almost complete neglected, through patches of bindweed in sandy soil and were like a forest in just four years from a single stem, which also appeared lack lustre the first year I had it.
Good luck and you've been warned.