I accidentally bent a pin on an Intel motherboard socket once. The pin was not contacting the LGA pin of the CPU. Turns out that particular "pin" was used for PCIe communication (my video card), and when I booted it, I didn't get any video from the graphics card. Some pins may just be a ground connection. If I was extremely lucky, I'd have bent one of those.
So how does it affect it? It affects it badly. Don't bend the CPU or motherboard pins.