Screen constantly blinking after Windows installation

So after My windows went bad I had to get new Windows and it had to be 10 home since I wanted to try them for a while. I successfully installed them but the screen is constantly crashing, I got the chance to go into resolution and set the native one which was 1440x900... And it started flashing, ut constantly flashes black to the error 'the current input timing is not supported on your monitor display. Please change it to 1440x900 or any others' which comes as a surprise as I already set it to that. This was happening before and I also tried booting in low resolution mode, the same happens. Need quick help!