We'll have to have a make and model of the motherboard.
Since this setup would need one stick of RAM and a GPU to show the BIOS your choice to try that or wait till we figure out the motherboard make, model and 3 beeps issue.
https://www.google.com/search?q=amd+cpu+3+beeps seems to say this was expected. As in, you need a few more parts.
This morning, We had a power outage. My computer was on, it has a AMD 6300 Six core, and a GTX 970, And I tried to boot it up about 4 hours after the outage, and it booted up, I put in my password, and tried to get logged into my game. (it's a gaming computer.) When it was loading Blizzard.net, it turned off all of the sudden. I tried turning it on, and saw the lights, then about 2 seconds later, it turned off. did it about 5 times. Also, the GPU fans are not running I found out. Now my usb wireless adapter also won't work. Any tips? I waited 7 hours, turned it on again, and it worked perfectly, (without wifi) and turned off again 15 mins later.