|Did you check your temps to see if you needed more cooling?|
Which fan connector did you use? CPU fan or case/system fan?
Are the fans similar enough to run together?
Did you remove the splitter?
Fan position and orientation is more important than the total number of fans. Name the position and orientation of the fans to determine if it was well thought out or detrimental from the beginning.
Check all connectors and cards to make sure that everything is seated properly. Look for pinched wires and loose screws that my have fallen into corners or under the motherboard.
When you cleared the CMOS with the jumper, did you unplug the power? You do not need to remove the CMOS battery when you are already using the CMOS jumper, it removes the battery from the circuit and shorts out any residual power the circuits may be carrying.
Are these other power supplies known working power supplies or were they just sitting around? If none of them are known to be working, then you have not accomplished anything by trying them.
If you did not disconnect the power before trying the second fan/splitter, you did not make sure that you were not carrying a static potential, or the fan splitter/ 'Y' connector was poorly made, then you may have damaged something.
You have to be a little bit crazy to keep you from going insane.