christerfred, I would think that if it TURNED OFF all by itself, and no matter how many times you push the on/off switch it remains in the OFF state, I certainly think it's BROKE. In fact I think that the "switch-mode-power-supply" may be in permanent SHUTDOWN mode. Here is a clue! When strange things happen to an LCD display, the first place to look is the power supply, be it a SMPS that lives on the floor or resides inside the plastic case of the monitor. I have worked on a few LCD displays and repaired a few of them. But I have never come across a magical "let it work" reset button. If Hannspree won't do anything in the way of warranty work, then go watch some of the longer video clips of "LCD monitor disassembly" and "LCD repair" @ YOUTUBE just so that you will know what is up with all the LCD monitors (all brands) that now have BLACK and LIFELESS lcd panels. Also do a visit to www.ccl-la.com/badcaps.htm
for additional info. You will also need to do a search for the "LCD flashlight test" to evaluate the state of your Hannspree SMPS. After doing the above, get back here and tell me what you want to do. If you feel that the information received at fixya was helpful, please rate this response at fixya. I'm louie12fix on fixya bye for now.