Not Optimum Mode
This message appears when the signal from the graphics card exceeds the maximum resolution or
frequency for the product.
Change the maximum resolution and frequency to suit the product performance, referring to
Standard Signal Mode Table (P.35).
The images on the screen look distorted.
Check the cable connection to the product.
The screen is not clear. The screen is blurry.
Remove any accessories (video extension cable, etc.) and try again.
Set the resolution and frequency to the recommended level.
The screen appears unstable and shaky. There are shadows or ghost images left on the screen.
Check that the resolution and frequency for the PC are within the range of resolution and frequency
compatible with the product. Next, if required, change the settings, referring to Standard Signal
Mode Table (P.35) in this manual and the
The screen is too bright. The screen is too dark.
Screen colour is inconsistent.
The colours on the screen have a shadow and are distorted.
White does not really look white.
There is no image on the screen and the power LED blinks every 0.5 to 1 second.
The product is operating in power-saving mode.
Press any key on the keyboard or move the mouse to return to normal operating mode.
Text is blurry.
If using a Windows OS (e.g. Windows 7, Windows 8, Windows 8.1 or Windows 10): Go to Control Panel
on your PC → Fonts → Adjust ClearType text and change Turn on ClearType.
menu on the product.
Video playback is choppy.
Playback of high-definition large video files can be choppy. This may be because the video player is
not optimised for the computer resource.
Try playing the file on another video player.
There is no sound.
Re-check the condition of the connected audio cable and/or adjust the volume.
Check the volume.
Check whether audio is set to mute.
The volume is too low.
Adjust the volume.
If the volume is still low after turning it up to the maximum level, adjust the volume on your PC sound
card or software programme.
Video is available but there is no sound.
Sound cannot be heard if a HDMI-DVI cable is used to connect the input device.
Connect the device using an HDMI cable.
Source device issue
A beeping sound is heard when my PC is booting.
If a beeping sound is heard when your PC is booting, have your PC serviced.