I have a computer I built and it worked great for around 2 years. Then it just died. I tested the power supply with a power supply tester and it passed. There are no beeps, no fans spin, nothing. There are two led buttons on the motherboard and both light up. I figured after my troubleshooting that the mother board was bad. I had it replaced, but same thing. Power supply tests fine (two testers), no fans spin, no beeps. I've tried a different video card before and after the motherboard replacement. I would think it would beep if the CPU(intel i7) itself was bad wouldn't it? I don't know where to go from here and looking from the community's advice.
So I would check the cpu, also. Mobos have been know to take them out when they go. It's not usual, but it happens.
I would also do the testing with the mobo out of the case (on newspaper, cardboard, something non-conductive) with 1 known working stick ram, video, psu. And manually jumping the power pins on the Front Panel header pins.