Problem with display

I'm not sure what's going on here, but I installed my SSD 2 days ago. I didn't change anything else apart from adding the SSD. I did a clean install of Windows, and everything seemed fine. Installed all the latest drivers and what not. Now when I'm on certain web pages, I get weird red dots appear, it's usually on gradients.

http://i.imgur.com/5DJK1.jpg

This didn't happen before I reinstalled Windows, so I haven't a clue what's going on.. :S
Any ideas?

Monitor cable has come loose from either end

Now I feel ******* stupid. Thank you!