I need help. i built a PC, and it behaves very strangely. When i press the power button, the lights come on, fan maxes out, HDD spins, bios shows up etc and then it immediately crashes (powers down) before booting into windows. Then it powers on automatically and this time boots correctly. Sometimes there is just one failed boot and sometimes it takes 2 such boots to correctly start the computer.
This unexpected shutdown never happens once it has booted in windows, just between the windows logo and bios menu. Any ideas?