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Question Old pc acting very weird / no POST

Mar 16, 2020
So I got this old pc from my uncle and it has some weird stuff going on, I've searched on web for a solution but couldn't find anything similar to my situation that could solve the problem.

The computer automatically starts when I plug the PSU, cpu fan and sys fan is running but there's no video or POST signal.

I've replaced the RAM, both fans and the PSU, tried to clear CMOS by taking off the battery and also plugged my GPU to the mobo: nothing changes.

Both fans seens to be running at 100%., which isnt normal (i guess?)

Pressing the power button doesnt do anything at all.

Any ideas of what could it be?