Chosen Solution
I have a PS2 Slim SCPH-90004 and I tried to turn it on but it didn’t , not even the red light was on, I remember last night seeing the red light. Any answer will be appreciated.
So I think I have a solution. Recently, I took it apart and cleaned the motherboard and the connectors using a toothbrush and 70% alcohol, then I reassembled it and 3 days later I tried to boot it up again and it worked. Now I don’t know what the problem was, maybe the power supply connector was not properly connected. Anyway I hope I helped someone.
