New Build Sudden Shut Down

[mm23]

Built my first PC a few months ago (specs below). While playing a game today, it suddenly powered down. When I turn it on now, the fans start to spin up, then stop. I swapped in a different power supply; same result. Any idea what would cause this? Fried motherboard? Something else? At a loss as to what I should look to replace or test.

CPU: Core i7 990x

Mobo: Asus Sabertooth x58

GPU: 2x MSI GTX 560 ti

PSU: Corsair 850W

SSD: Samsung 470

 

[S_I_N]

try resetting cmos and see what happens