PC will not power on. Fans and Motherboard LED will temporarily turn on and then go right back off.

I built my first PC last November and it was running fine until yesterday night. I left home for ~30-60 minutes with the computer running. When I came home, the computer was off and would not turn back on.

I push the power button and the power supply/case fans spin up for about a second, and one of the LEDs on the motherboard blinks on and then off again. Hitting the power button again does nothing unless I first flip the power switch off for about a minute and wait for a clicking sound (sounds a little like a metallic switch flipping). At this point I can flip the power switch back on, hit the power button and get the same temporary fan spin-up/LED.

Windows 8.1

Rosewill Capstone 650W Power Supply

Intel i5 4690 CPU

MSI Z97 G45 Motherboard

None of the other electronics in my house seemed to have anything wrong with them, including my laptop plugged into the same power strip. It was pretty hot yesterday, so I'm wondering if it could have overheated? (Forgive me, I'm not super technologically inclined)

Any suggestions? Thanks!