i just installed a new cpu cooler and everything was running fine before that, after i put everything back the way they used to be, i push the power button and it turns , my cpu fan is running , my front and back fans are running too, i don't hear any beep from the motherboard like usual when you start your pc/ and then nothing happens after that, my monitor is showing nothing, and my USB the ones that are plugged in the back aren't even working, like my keyboard and mouse and internet cable.
also my graphics card isn't running as well, i checked the fan and it's not working???
what could be the problem !!!