Pc wont turn on, but some fans spin

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May 14, 2017
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My pc doesnt turn on. I didnt use it for about 2 days because I was very busy. So, when I finally had some free time, I tried to turn it on but nothing happened. I opened the case and noticed the Motherboard had (M7A78L ) had its led light on and made a beeping sound. I also made sure the little battery was working. My mouse and keyboard's lights turn on, too. However, when I press the power button, some fans start to spin after about a minute. First, they try to spin but cant because apparently they dont have enought power. But then they begin to gain speed. I dont think the PSU is broken as it shows no signs of being burnt (it has happened to me before). I also tried to check everything was plugged in firml, but am not sure I checked everything (I dont want to screw up). What could be causing these issues?