I set out to build a p iii matrox g400 pc. Have everything, but the mobo is giving me hard time. No post so far. CPU and RAM are good, checked with another motherboard. Batteries are fresh. Couldn’t check the Matrox because my other motherboard has no AGP slot. Tried another CPU and RAM just in case with no luck. So its either the card, PSU or most likely the mobo - asus p3v4x. Need another trip to storage to try another graphics card and psu. There is a note in the manual that this board needs 10mA on 5v standby lead to work. Not sure how to check this aside from trying another psu. Have no retro atx psus, just the new ones.