I have a gx240. When I plug in the power cord, the the fan starts. The monitor power light goes green for a few seconds, but then back to amber. Holding on/off button 'in' will stop the fan. I can then turn on the fan and turn the monitor power light to green for a few seconds by pressing the power button again - but that is all that happens. I tried replacing the battery with same result. I have checked all connections with the cover off and can see nothing amiss.