Desktop displays black through the GPU and nothing at all in the onboard GPU

[Calaerdir]

Hey all, need help with my desktop. I have a prime b450m-gaming/br motherboard, a Gigabyte 2060 super gpu and a ryzen 5 CPU. My desktop has been running okay for almost a year, but I tried to turn it on today and noticed the display was coming in and out and after a while it turned black for good. Trying to turn on the monitor in the onboard gpu did nothing, it didn't even recognize a display was connected. The monitor is working fine, I'm using it in my notebook. I disconnected all extra power consumption like fans etc but still it doesn't work. When I turn it on there's one beep which according to the asus code is "all good" but all is not good at all. I'm suspecting the motherboard, but I'm not sure. Can someone help me? I need the desktop to work. Thanks in advance guys