Hi so i will start to play Minecraft on my old dell m6700 and then will start to freeze up the screen will go black though the speaker will still work for a few seconds after but then the entire computer crashes. Any ideas?

entire spec at the moment is i7-3940xm, FirePro m6000, 16gb ram, no battery (will be getting it in the mail soon), and 130w ac adapter (will be getting a 240 in the mail as well).

I plan on putting a 780m in but I want to know if its a issue with the card itself so i know if i have to get the new one before i give it to my friend.