Motherboards

[DestinySpork]

I know this is not really the right thing for this forum, but I'm sure someone will know.
I built my new computer recently, and had it working fine. However, when I upgraded my PSU to power the graphics card, my motherboard refuses to work, even on the old PSU. I have tried the reset and leaving the mobo without power for several days without power, and still nothing. Is it dead? Please let me know, and also any way I could fix it.

[TheBay]

Have you got the 4 or 8 pin ATX additional power plugged in? And it's the right one, not the PCIe one!!

[hobo2566]

When you power it up with new PSU does it give any signs of life(fan spinning, led lights, etc.)?

Was your "new" PSU out of box, like brand new?

Any info on psu, motherboard, gpu and other hardware info would be appreciated.

[allikat]

Things die in transit, it's known as DOA or Dead On Arrival. 

1: Check the PSU for the smells of departing magic smoke,
2: Go round and double, then triple check all your connections. They are all keyed to fit only in the right places. Any plug that needs force is being plugged into the wrong place.
3: and tell us that the user of an electronics forum didn't buy the cheapest one-hung-low brand PSU? Please?

Things that bite people:
There are 2 different 8 pin sockets, one on the board, one on graphics cards with very similar sockets.  They are keyed differently and have different pinouts, but a strong person can force the wrong plug into the socket, leading to possible magic smoke loss as you connect high current +12v directly to ground.
Low cost PSUs are junk.  Clean power is important in your projects and it's important in your computer.