Deus Ex Alpha

Ok so I got my new videocard, had some problems putting that massive thing in my computer but I'm used to sticking big things in small areas so that went ok. Now the problem is the assholes where I bought this thing didn't give me any CD with it, or manual. So like now my PC doesn't recognize it or something? Anyways installed some driver because I thought that would work, and now my PC wont start with the new videocard (well it starts and then shutsdown for some gay reason)

So my question is actually... How the hell can I get this thing to work?!!

Please help

Edit: I read some stuff from google, people saying it's power related... Though I wonder why it only happened after installing the driver

So it is power related, thanks Nobody <3

Lock pls?

Lol 8800 gts is Nivida graphics card yes? type in MSI in google and go to downloads , and then search a new driver for your graphics card and turn off SLI