I took out my Radeon HD 4670 and decided to try out my Galaxy Geforce GT 520 and the monitor just shuts off when it finishes booting. I put in my Mint 14 install disk and does the same thing. I have an old Ubuntu 12.04 disk and does show the desktop but shows the card as unknown.

My system currently has Mint 14 installed. What is causing this to happen?