Hi.. would like to ask, i have an Asus P8B75-V

Issue A: This mobo suppose to support i5/i7 3rd generation, but when I put processor in, no beep and no display, but when I put in i5 2nd generation it works. I've updated bios to the latest version and also clear cmos but still same problem.

Issue B: Notice there 1 pin on processor socket dented, but still able to booth.

Any ideas what is the problem and how much to fix? I'll bare for cost to ship back to East Malaysia.