Completely new build doesn't start up, just gets 1 long and 2 short beeps with no display. I thought it was faulty ram so i bought more ram and no difference. I have tried on board graphics and the gpu. I have tried removing the GPU with no difference. I just took it all apart and put it back together including reseating the cpu, and it booted, but I didn't connect the cpu fan and keyboard so I got the errors "CPU fan error", "no keyboard attached" and "chassis intrude"? I reattached the cpu fan and inserted the keyboard, rebooted and back to no display with 1 long and 2 short beeps. Any help will be very much appreciated, thankyou.