Causes
- Loose, worn, or failed power connection — the Q27G2 is powered by an external power adapter (brick). A cable that is only partially seated at the monitor or the brick, a frayed or bent barrel plug, or a failing adapter drops all power and the panel stays completely dark even though it looks plugged in.
- A dead outlet or overloaded power strip — if the wall outlet is dead, the surge protector has tripped, or the monitor shares a loaded power strip with hungry equipment, the Q27G2 receives no power and appears to be "dead" even though nothing is wrong with the monitor itself.
- The monitor is in standby and not receiving a signal — this VA panel goes into standby and dims to a low-power LED when it loses its input. If the PC is off, in sleep, or the video cable is disconnected, the monitor sits in standby and looks "off" unless you press the joystick or the input handshake returns.
- Eco Mode / deep-sleep OSD setting holding the panel off — the Q27G2's OSD Eco Mode and power-saving settings can drop the display to a very low power state (or fully off) after periods of no signal. Combined with the standby-LED behavior, this makes a healthy monitor look unrecoverably dead.
- A firmware or internal power-board fault — less common, but a failed power board, an old firmware bug that hangs the panel in a no-power state, or a power surge that damaged the adapter or board can leave the monitor genuinely unable to turn on.
How to Fix
- Reseat the power and video connections — unplug the power barrel from the Q27G2 and the adapter from the wall, then plug them back in firmly on both ends. Also reseat the DisplayPort/HDMI cable at the monitor and the PC, because a lost input keeps the monitor in standby and makes it look powered off.
- Test a different outlet directly — plug the Q27G2 straight into a known-working wall outlet (not through the power strip or an overloaded surge protector). If it turns on, the original outlet or strip was the problem; confirm the strip isn't tripped and use an outlet with headroom for the load.
- Power-cycle by unplugging for 30 seconds — with everything connected, unplug the monitor from its power source for about 30 seconds (this clears the standby/handshake state), plug it back in, and press the power joystick. This simple reset fixes most panels that appear "dead" after sleep or a power blip.
- Wake it and read the standby LED — with the monitor powered and the PC on, press the joystick/center button or move the mouse to wake the panel. The Q27G2's power LED glows white when it has signal and dark orange in standby, so confirm whether the monitor has power at all before assuming the panel is broken. If the LED is dark orange, the issue is signal, not power.
- Disable Eco Mode / power saving in the OSD — if the panel turns on but drops back off after no signal, press the joystick, open the OSD, and turn Eco Mode and aggressive power-saving settings Off (or set them to Standard). This stops the low-power state from visually killing the display.
- Test the panel on another device — connect the Q27G2 to another PC, laptop, or console with a known-good cable. If it displays fine, the fault was the original PC, cable, or signal; if it stays dark on other devices too, the adapter or internal board is faulty and the unit should go back under warranty rather than be repaired at home.