So I did reapply thermal compound on my cpu with a proper way following in youtube video. But after I plug my cpu and HS, turn it on, there's no video and no beep sound. I tried take off my RAM, but there's still no beep.
Maybe my mobo is dead? or my CPU?
i had a similar problem. in my case it was the power supply too.
maybe you don't have an onboard speaker so you have to connect the speaker before you can hear any beep.