i recently just replaced my motherboard and psu because i thought they were dead due to continous very short fast beeps and no booting. So i put the replacements in today and everything looks to be powered up (psu fan,cpu fan case fans ect) but the computer will not turn on/boot... now i checked every connection everything was good. I then tried to just power up with the cpu, 1 stick of ram, and the video card (no hdd/ide devices) still nothing.. no bios nothing. please help..