yeah, my sansui monitor screen is flickering like crazy with lines, is this a goner?

Nah, this is usually fixable. Start with the cable—swap it out for a different HDMI or DP cable.

Next, on your computer, lower the refresh rate in the display settings, like from 240Hz down to 144Hz or 60Hz. Then, go into the monitor's own menu and turn OFF FreeSync or Adaptive-Sync. Updating your graphics card driver often helps too.