I just bought my power supply two days ago, it's an OCZ Modxstream 700w. I put in my old 500w to check if it would work, but it still wouldn't turn on.
I also checked if my CPU was the problem by putting and testing it in my brother's computer, it worked completely fine. Could it be the motherboard? if so, how can I tell?
The motherboard model is an MSI 870A-G54