If this has a graphics card, try using another, if its onboard, put one in the pci slot and try it, also you may want to remove all rams and turn the pc on to see if it makes beeping sounds to alert that the rams are out, if it beeps then bios and cpu is good, if not, your looking certainly at a hardware fault on a circuit level, if this board has an amd northbridge, that could be your culprit. Would need to do a BGA reflow. To know for sure, you can get a pci diagnostic debug card and see where its getting stuck, if your values stay at 00 then circuit problem is indeed the cause on some itchy mosfet or regulator. Cannot know for sure without looking at it myself. My experience, all AMD chipsets begin to overheat in time a lot quicker then intel and thats why there cheap, at some point specially when not enough ventilation or blocked fan, the BGA chip will fail as they heat up in course of life span melting its solder balls underneath, and reballing will not fix the issue as it will just fail again heating up very quicky as its worn out, replacing the chip is the only solution to make it last a few more years!! Personally, I advise costumers to stay away from AMD.
