Greetings,
The page for your board isn't loading for me this AM. I looked at it yesterday.
The pins I was referring to are in the socket. They more resemble "nubbins" but can be smashed or bent.
Basically, you'd want to verify all connection, reset BIOS, disconnect all peripherals, and test your memory. You've basically done all of this, except inspect the CPU socket. I'm willing to bet its fine, but wise to check.
Bench testing is the next step. (Removing the board from the case). Now you can closely inspect the board (both sides) and components, electrical capacitors, etc. You are looking for discolored, bulging or blackened areas.
CPU replacement is not the first thing to change if you experience BSOD. Normally you would reset the BIOS, ensure there were no overheating issues, test memory, then disconnect all peripherals.
That said, you know your system best. If you had reason to think something was damaged electrically because of OC, etc. I would believe you. It is still wise to check the obvious, anything which was changed out.
If the LV3 LED is staying on the entire time from power up to reboot loop, then that's the issue. if its only a brief flicker, it might be something else. Given the age, I wouldn't invest a great deal in the hardware. If you have a computer shop nearby, ask them if they can test the CPU for you, but I wouldn't buy anymore hardware until I was certain. If it POSTs, then you'll know its probably the board.