Half Monitor is Colored lines.. How do I fix?

I recently reformatted my computer by myself. Ever since then the bottom part of my screen is different color lines. I can still feel for the start bottom and all like the mouse still detects functioning task bar and start button how I cannt see them because the colored lines is cutting off it being visible to me. Is there anyway to fix this without having to buy a brand new monitor?

I have a Hannspree monitor. 24 inch. Thank you in advance.