Checked the fan and it's good, I disconnected the CD, HD, removed Graphics card and only have the case fan and CPU fan connected. Connected directly to the Mobo display connector, nothing on the screen. Power supply, case fan and CPU fan spins for 1 sec and then stops. Have to turn power off, disconnect power cord to get it to do this again. Tried without any RAM, no beeps, no post. Nothing on display with either graphics card or onboard graphics connector.