Dell SE178WFPc Problems

so i got a SE178WFPc monitor from a friend it was working fine for a couple days but today turned my pc on and it was flickering on start-up (left side of screen) and all areas with text were really fuzzy, after about 20-30 seconds it just went black nothing else happened, but the flickering lines I mentioned before were faintly visible (still on the left of the screen) not sure what the problem could be back on my old monitor for now. was going to try getting a new VGA cable see if that helps but thought id ask here first. Also the power light was still blue and all connections were in properly.

hope you can help thanks 

My PC specs are also really low but will be getting a new tower next week... can pc performance affect monitors in the areas said above?