Resolution issues

[yanpof]

HEllo
I'm trying to run resolume 4 on an iMac 2.7 Ghz with a radeon HD 6770m 512mb on a LED screen
the resolution of the screen is 1664/480, until now i have blue lines everywhere no matter of the resolution I'm using. the signal is sent to an other computer where it's processed and scaled.

i was using a PC until it crashed which i didn't set up myself, so no idea of the way it was done

I'm obviously not a technician at all, please help me

[veek]

First of all tell the resolution that you have on your iMac output. As I know the led has a native 1024 x 768 resolution. Other resolution are obtained by scalling, cropping and moving the original image.
So at least you must try to provide an output resolution of 1024 x 768 at 60 Hz. If you must fill with your composition all 1664 pixel width you must have an HD output resolution 1920 x 1080 at 60 Hz.
Hope it helps.

[yanpof]

thank you for your answer!
actually I tried every single output resolution, the only one that was working without glitches is 800/600 (on this screen) everything was working on another " normal monitor"!
so I downloaded switchres, created an output of 1664/480 and everything is perfect even the resolution looks way better then earlier!

anyway thank you very much