We have three Cisco 7936 Conference station. These phones are working fine just 2 days back all three 7936 stop working, on all 7936 RED led is blinking and blank LCD display. Even after restarting it is giving the same problem right after powering on. I am sure it is some hardware problem. I want to know if some one face these problem before and whether the problem is with power adapter or phone and why all 7936 get problem at same time ? I don't have any spare power adapter or 7936 apart from these 3 pair to test and know the exact reason of problem, and these three phones with three adapter not working with any combination.