I recently bought a new hdd a Seagate Barracuda 7200.10 ST3250310AS 250GB 7200 RPM 8MB Cache SATA 3.0Gb/s. I loaded windows xp pro on it and put in my drivers etc. While installing some software I went onto the internet to look up adobe flash player. While I was doing that my monitor would go black for a few seconds and then the picture would come up for less then a second. Once I closed the internet browser it stopped fucntioning like that. So when the software was finished installing I went back to adobe's site and it still continued to perform the same problem. I restarted my computer and went to the same site and still had the same problem.
I then uninstalled my graphics drivers and reinstalled them to see if that was the problem. It satarted to work fine but then I would get lines going through the screen. I would really notice them when I went to a website that had a dark background. Then the problem of the screen going black starteds to happen when changeing programs or certain websites.
I am almost sure it is either the graphics card or the monitor, but since I have little experience with computers I thought I would put this on here and ask people with more experience then myself.