Reinstall cpu no display

Hello,
I recently got a new computer and everything worked fine. I tried a new am3+ processor that my brother told me would be better. I took out my cpu and tried to install the one my brother gave me. After a few attempts it did not work, so I put my other one back in. At first it would not fit, but I wiggled it a little ( no hard pressure) and it fit just like normal. I put on the heat sink and everything ran fine inside the computer, but my monitor no longer detects my computer attached to it. No bent pins on the cpu.