Hi SLAYER. Although I've read that some motherboards don't have a POST beep, I personally haven't come across one. The most likely cause of no beep is that there isn't a connection between the case speaker and the motherboard. Possible causes that immediately come to mind are broken wire or the speaker connector doesn't match the motherboard header pins - possible one is wired for 3 pins and the other for 2 pins. If the motherboard connection is correct, remove the socket from the header and touch a 1.5V battery to the connector. You should get a distinct clicking from the speaker.