i have the exact same problem. computer powers on (fans all start, GPU, HDD and dvd drive powers up, HDD and power leds stay on) but there is no display on my monitor.
tried new monitor, GPU, PSU, RAM and clearing the BIOS. with no change.
the only thing it could be is either the motherboard or CPU. i am leaning towards the motherboard as i the cpu is always adequately cooled.
i never get any beeps, but i never did when it was working.
anything i can try before i RMA it