PC won't post

Jun 17, 2018
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Hi, so last night I tried moving my PC into a new case and when I got it into the new case it won't turn on. The thing is the power supply is working fine and is getting power to the USB ports of the motherboard to light up my keyboard. I've made sure the pins for the case were placed correctly and it wouldn't start and I've tried manually jumping it by bridging the power button pins with a screw driver and it still won't turn on. I've checked my 24 pin and my 4 pin to make sure theyre in securely. I think the problem is with my motherboard because power is flowing it just won't start. Please help thanks for your time
P.s. this is an AM3+ motherboard from a prebuilt IBUYPOWER i-Series 301 PC