My computer won’t start

This is what is happening:
I have a pc powered by AMD processor. I have an UPS through which I power the PC.

I switch on the power supply. Next I switch on the UPS. As soon I switch on the UPS, the green light glows in my PC and motherboard without having to press the power switch on the PC. At this point, the fan is not running, the PC is not booting up. Next I press the power switch on my PC. Now the fan runs, monitor LED light (green) just keeps blinking, no display of anything. After a few seconds, I hear 2 beeps and then nothing happens. The fan keeps running.