I have a strange but not a new problem. When I try to run Ubuntu 13.10 live from the USB on my new hp notebook with win 8.1, my notebook screen turns off. I Google this issue and found lots of similar posts on many sites but none of the solutions made any sense to me. I tried connecting my tv via hdmi and interestingly it displayed the contents whike my notebook display stayed off. When i checked settings, ubuntu detected both displays. so i changed the res of my tv output to 1080p and idk how but my notebook display turned on. I saved the settings , disconnected the tv abd restarted but the same problem happened again. Any ideas how to fix this? btw i got a haswell notebook with intel 4600 and gt 740m.