Yeah open up your case and take a look at the PSU. Maybe just take a picture of it and post it here. You might need a Philips screwdriver but that's about it. If your case has thumb screws you won't need any tools at all.
http://i.imgur.com/2Q46wvY.png Currently watching: X-Files, Shameless, Futurama
Oh my gosh I lol'd so hard at GT 610. I picked up one of those when my 680 died cause the error I was getting on my mobo's number display could have been a vid card problem or a mobo problem. Got that thing dirt cheap to check if it was my mobo. Didn't have on-board graphics cause I have a 3820. But yeah, since you're a noob, here's a useful link for you: http://www.videocardcomparisons.com/reviews/nvidia-geforce-nomenclature-explained/
"Nowhere is longer safe. The earth MOVES under our feet. The great world tree, Yggdrasil, trembles to it's roots."