After running my 3 R606's for some time now, I am having trouble getting 1 restarted today. It stopped hashing this afternoon, but seemed to remain online with the pool. When I got home I restarted and it went back to work. After about 30 minutes of hashing it stopped and I am unable to get it restarted. I unplug/plugin, restart server, change settings, changed power supply and it just says, no chips found - ZOMBIE.

Any help is greatly appreciated. Thank you.