Sorry Bruce, slight cock-up on my part. :-( Suggest try the following instead: # For display in the Windows desktop # 2560 x 1440 (51hz) startmode mode_name:2560x1440 x_res:2560 y_res:1440 pixel_rate:197000 h_timings:10,10,16,2560,0,0 v_timings:10,0,0,1440,0,0 sync_pol:0 endmode Fingers crossed. Alex.