My PC screen flickers, how can I stop this?

Check and reseat your video cables first, also reseat your video card in the computer. You can also do the discharge thing with your monitor like you did with your laptop, though it is usually less of an issue and not as likely to change anything. The next thing you can try is changing the refresh rate of the screen to a higher value by changing it in the display properties settings in your computer's operating system. The refresh rate is most effective on CRT monitors and in environments with fluorescent lighting.