cant figure this out

so my comp bugged out the other day. i turned my monitor on after it being off for a few hours and i had columns of white rectangles all across my monitor. so i shut my comp down for a while cause i thought it might just be cause it was on for so long. after 7 hours of being off i turned it on and everything was fine, so i went to bed and shut my monitor off. when i woke up i had the white columns again all across my monitor. it has been like this for a few days now and it wont go back. i was wondering if anyone knew of any viruses or spy wear or ad-wear that can do this or is it possibly a hardware issue. also before you ask i have a video card that my monitor is plugged into and i think that is what it is but im not sure and i cannot find the converter to plug my monitor directly into my motherboard to bypass the video card. also when i turn my comp on and i go into the system screen its all messed up, nothings in the right place and i cannot see what is what. last but not least, when i start it up and it goes from the boot screen to the windows loading screen it actually goes to a random screen first with columns of weird letters and number and the screen is blue purple and black.


any help ideas, or suggestions would be great seeing as i built my comp myself and i like to fix it when it breaks.

 

ya i have tried a different monitor and mine on my friends computer and i know its not that so i guess ill check out the video card.

 

so i just got back from my work trip and i removed my video card and looked at it, everything seems fine and its not really dirty but i am still having the problem and new ideas?

 

ya that is what i was thinking, but my video card is agp and i dont have a PCI express slot so i need to see if anyone of my friends has a agp slot video card so i can check it.