Console won’t stay on

So my PS3 Slim won’t stay on, red light shows up when I plug it in but when I try turning it on it goes green fan turns on for a quick sec then just goes off ( no light at all). Wouldn’t stay on long enough to get the disc out of it. I replaced power supply and dusted EVERYTHING. I’m going to buy new fan but wondering if it could be something else as I don’t want to replace my system.