Version: 38.0.2125.110 / 6158.70.0 (Official Build) stable-channel daisy
Device: Samsung 303C
External Monitor: Westinghouse SK-26H730S TV
Cable: HDMI

Spun off from Issue 631182, reported in
   https://groups.google.com/a/googleproductforums.com/d/msgid/chromebook-central/04b28194-2384-44e1-8a87-3d0332027a05%40googleproductforums.com:

"I have a Westinghouse SK-26H730S TV, and a brand new HDMI cord to connect it to my Samsung CB 303C. I connected the devices with no issue and was able to watch Netflix with no problems. That night, I turned the television off while the CB was in sleep mode. The next morning, the television was off and the CB was closed. I removed the HDMI cable from the CB and used it throughout the day. That evening when I reconnected the HDMI cable (which was still connected to the powered-off TV) to the CB, it froze. I haven't been able to connect the two since - the CB freezes or loads a blank start page when connected to the TV. I have tried every iteration of devices on/off when connecting - nothing works. The only thing I have had a modicum of success with was starting what I wanted to watch, turning the screen brightness on the CB all the way down, then connecting to the television. The CB didn't freeze, but it was not detected by the television, either. The TV has two HDMI-in ports -- the issue persists when either are used."

More info in comments of forum.