Goodness sakes... can you please return things to their initial state? I'm seeing advice to proceed to do stuff with jumpers, without first identifying which motherboard is being used. Then I see a photo, with no obvious jumper, and what appears to be a person holding some wires that fit onto a connector.
That is not a jumper. A jumper is a little piece of plastic with embedded metal, that fits over two nearby pins so that electricity goes from one pin to another. No wires needed.
You said "I see the BIOS thing come up (American Megatrends)." I'm unclear if that was just "normal behavior", or what you experienced before starting to move parts around. If you can get back to the BIOS setup screen, I suggest looking for an option to Restore to defaults. That will usually be more likely to fix things than to break things (although this is free advice, which may have some risk, so I cannot offer any actual guarantee). The safest course of action is to document every setting, and determine the normal defaults, but such thoroughness is usually much more time consuming that what is necessary.
If the initial BIOS setup screen looks like American Megatrends full screen (sample picture), then "Load Fail-Safe Defaults" may be the best option (or "Load Optimized Defaults" if that doens't work well. If your BIOS has a menu among the top, then American Megatrends top-menu (sample picture) shows that "Load Optimized Defaults" may be on the "Exit" menu.
If you can't even get to the BIOS setup screen, then using a jumper to connect two pins may be useful. However, you should first identify which pins to jumper. Figure out the manufacturer and model number of the motherboard. (If you have a major "name brand" computer, like a "Dell", you might benefit from finding out a "service tag" number.) Then follow instructions that are specific to the motherboard you are using.