Black Screen During Post On Cold Bootup

I have built my computer about 2 months ago now, and had nothing but issues with it, display drivers stopped responding, alot of BSOD (bccode 1a and 50), black screens, lockups and so forth, i have FINALLY read enough forums over this 2 month period to solve majority of problems accept one, Computer runs fine, but every morning on cold bootup it'll start to load POST and then go to a black screen and just stay there unless i reboot the computer and then it'll bootup fine. I will turn off the computer after that and go to work for about 8-10hours come home and turn it on all fine, untill the next day. I have tried new ram, fail safe settings in bios, updated bios to the lastest, bought a new power supply, tried reconnecting everything, unpluged storage harddrive. Only thing i could think of causing the problem is my video card drivers, because as soon as i install the drivers i get "drivers have stopped responding but have recovered" screen would lock up freeze/artifacts and then come back, until i changed my idle clocked from 157/300 to 400/900 and it sorted out that problem, but those settings dont kick in until i reach into desktop, could it be trying to load the ati drivers during post and black screening?