Umm google is your friend:
I would test the memory. Another easy test is test the PSU under load and make sure you get correct voltage. Then I would test the video card (swap out)
Again this is not tech support. If you feel helpless or lost on what to do next engage a professional. Technet is a better suited site for this kind of discussion. I am kinda getting tired of fix my hardware/COTS software issue posts.
Thanks for the condescending attitude! Next time, don't post.