same problem, woke up this morning & it wont' show the desktop, but the screen works because I can see it try for HDMI/VGA. It must have a signal because my computer tries to put the display on it & it's got a solid red LED indicator. The LED backlights light up. The monitor menu button does nothing. I've got dual SA350s so I know its the monitor, doesn't matter if it's VGA or HDMI.
The display will not show a picture when plugged into HDMI or VGA, the graphics card is not at fault due to I can plug another screen in. When I turn on the SA350 it flickers with the HDMI to the Analog symbol then turns it self off with a solid red light.
Help fixing this would be fantastic