Verify that the PC is set to a resolution and a refresh-rate that are accepted by the TV (see the manual of the TV).
To change the resolution of your (Windows-)PC:
- Go to the desktop of your PC
- Click right. The desktop menu appears.
- Go to settings and set the right resolution
- Click on tab ADVANCED
- Click on tab MONITOR
- Set the refresh rate to 60 Hz and confirm with OK