i bought a thin mini itx motherboard, assuming that it would function identically to a mini itx motherboard. i was wrong. it doesn't have a 24 pin connector, only a 4 pin. at first i just plugged the 4 pin into it, and whenever the power supply was plugged into the wall, it's fan would run at max whether or not the computer was actually on. when i "turned on" the computer, the cpu fan would run at max, and the case's on light would turn on, but nothing else would happen. no video, no beeps. sometimes it would restart itself. i got an external power brick, and that allowed me to properly turn the computer on. however, the internal power supply would still run it's fans at max. the graphics card also ran it's fans at max, but the graphics card and hard drive still wouldn't actually work. when i took out the internal power supply, the computer still ran off of the external power brick, but the graphics card and hard drive don't receive any power at all now. how do i get this computer to work? why won't it work? the motherboard is an asrock imb-1215.