Question PC often doesn't detect my GPU

Mar 8, 2020
52
3
35
Hello everyone, I have a dell optiplex 7020 and an XFX RX 570 4 GB GPU...
So the problem I am having is that the PC sometimes doesn't detect my GPU (which is the XFX RX 570) and then it runs off the integrated GPU (Which is intel HD 4600), when it ran on the integrated GPU I opened the BIOS menu and noticed the PC wasn't detecting my RX 570...
So that problem happens in 4 out of each 5 boots, so only in 1 of each 5 boot-ups the PC detects my RX 570 and works normally... I don't know why that problem is happening... Even when the GPU is not detected by the PC the GPU's little blue lamp that is on it's side gets lit (this lamp indicates if the GPU is working) and it's fans also work as if it's working normally...

So why is this problem happening? how can I fix it?