CPU fan starts, a low hum sound on speaker and a vroom sound from cpu/fan
I just bought a new pentium 4 3.0 Ghz motherboard with 256 ram, connected everything as directed on the manual and plugged the power connector then started the computer. The fan starts then nothing else. All I hear is a very low hum/beep sound from the computer speaker which is immediately followed by a 'vroom' sound from the cpu/fan location. At one time, after leaving it for about 3 minutes, it started up to the windows boot options menu. I resetted it to set the Bios and it went back to its former state. Please I need help.