Re: i5 3350 not recognized by H77M
I think parsec also was interested in what happens when you press the power button.
Fans start to spin? Is there any sound from pc speaker(if its connected to motherboard pins)?
Can you run it again without unplug power cable?
You can also try to use 1 memory module and disconnect all hdd/odd (may help if there problem with "old" psu).
Also you can check 3350p in other motherboard, but i don't think its DOA
Sorry for my English, its not my native language.