Odd scenario leads to No POST/beeps/video. Is my mobo toast?

[Petars]

About a week ago my friend had an issue with his computer where he got no POST, beeps, or video. He decided it was the fault of his motherboard and basically scrapped his whole build in place of another. I've been in store for a cpu upgrade and figured I could buy his old one off him, an i5-3450...especially given that his old gpu and ram work fine, this lead me to believe the whole thing wasn't fried or anything. I also figured that if it didn't work, then no harm no foul and we trade back (little did I know). My computer's been working flawlessly for some 4-5 years now including earlier today, but for some inexplicably strange reason, after installing his processor my computer started having the exact same problem. I immediately reverted the change to no avail. Now, under essentially all hardware combinations (his processor / my processor, both sticks of ram / 1 stick of ram / no sticks of ram, dedicated gpu / no dedicated gpu) my computer refuses to pass POST, beep, or provide video output. I can see my fans spinning and that's about it. I've checked everything in the guide that gets frequently posted in response to this issue. I know it isn't connection issues or similar possibilities because the computer was in perfect working condition prior to the swap. I'm posting this off of my phone and praying that you guys may have an idea that could help me. Thanks a million.

PC Specs:
CPU: i3-2100
Mobo: H61M-P21
RAM: 6gb (1x4gb, 1x2gb)
GPU: EVGA GTX 960 SC 2GB
PSU: XFX Pro 450w
HDD: WD Blue 500gb running Win7

 

[Petars]

Anyone have any feedback? I did further research and found out that not only are CPUs typically hard to kill, but once they're done they're done and shouldn't 'transfer' their damage to other boards (otherwise how would you even test to see that it works)