Can't access Linode at all after reboot

Hope someone can help this is urgent and critical!

It seemed like my linode had frozen and I rebooted. Now while the control panel says it is running, I can't ssh into it at all (no response) and none of the services (apache, courier etc ) seem to be running at all. Is this a problem with my server (and if so is there anything I can do to recover it other than can comlete rebuild?), or is the a netowrking problem with Linodes right now?

Thanks!!

PEter