I tried another card and have the same issue. So it is either the monitor or the mobo/CPU.

Thanks for all the replies. No, I don't have a CRT and honestly I dont wanna get one. I will try another monitor. The one that I am using is from quite an unknown brand Emperex LM-1905, and no, no any jumpers on it. I will update the post once I find something.

Hi. I'm new here. Recently I decided to remove the dust from some old hardware and make a retro build. I have an 586TX motherboard with an S3 Tri64, and a Cyrix CPU. I cleaned everything, repasted the CPU and plugged it to an old PSU. Now I hooked this test bench to a relatively new 1440x900 LCD …