http://www.youtube.com/watch?v=5WdqU63tS4Q http://www.youtube.com/watch?v=Q4hUkiEU7AE I got to detatching the 4 wires on the right but the last 1 got stuck and I tried for 20 minutes to get it out, and just gave up.
I'm not sure why you linked a vid showing how to repair a monitor, when you should be taking out the gfx card to replace it.
Think about it. If your monitor is busted, it will display the messed up colours all the time. Even when you're staring at your desktop wallpaper.
If it happens ONLY during gaming (and maybe some video playback), it's 99% of the time the gfx card.
Take it out, clean the dust from cooler, remove cooler, remove the thermal paste, apply new thermal past, attach cooler again, install and see it it's better. Make sure you don't fry it from static electricity build up.
If it is still messed up, see if you can get a spare one somewhere, install it and your troubles should be gone.