DIAGNOSIS This is a power state handshake issue between your PC's graphics card and the monitor, often related to the monitor's HDMI Link or power-saving settings.
FIX Disable the monitor's deepest sleep mode and check your GPU settings.
- On the monitor, press the joystick. Navigate to System > Power Saving and set it to Off.
- In the same System menu, find HDMI Link and set it to Off. This prevents the monitor from trying to sync power states with the PC, which often fails.
- On your Windows PC, go to Control Panel > Hardware and Sound > Power Options > Change plan settings > Change advanced power settings. Expand PCI Express > Link State Power Management and set it to Off.
IF THAT DIDN'T WORK Update your graphics card drivers from NVIDIA, AMD, or Intel's website. Also, try a different high-quality HDMI or DisplayPort cable; a faulty cable can break the wake-up signal.
HEADS UP With Power Saving off, the monitor will use more energy in standby (the power LED will stay amber instead of off). This is the trade-off for reliable wake-up. The HDMI Link feature is only useful if you want the monitor to auto-switch on when you turn on a game console.