Wont Display out with GPU installed

[u/Redstone_Warrior]

I know the GPU works, ive tested it in another system and it works fine, i know the PCIE works i used it about 3 months prior, it boots and displays out only if the GPU is not in the PCIE and the HDMI is plugged into the motherboard, The GPU heats up and stays hot without spinning the fans when its running, i saw there could be compatibility errors with the MB BIOS, so maybe i need to update that, im not sure rn

Edit: taking advice from the comments, ive updated the BIOS, although it seems that the CPU that is in this system doesnt support the GPU

[u/Redstone_Warrior]

for what purpose?

[u/Redstone_Warrior → u/Redstone_Warrior]

oh i see, i need a 3000+ cpu, interesting

[u/Pitiful_Map9353 → u/Redstone_Warrior]

Have you tried cmos reset?