CPU overload after possible short on motherboard.

My MacBook Pro A1990 has been running pretty hot when I’m gaming so I decided to open it up and lean out dust inside.

I originally was going to take out the fans and clean them but I quickly decided that was going to be far more than I felt like dealing with last night, but in the process I had a pair of tweezers I was going to removed the speaker cable and had forgotten to first unhook the battery! Ugh! My tweezers momentarily connected with nearby components and sparked. Did I short it out?

I see now marks. The laptop was very dusty so I just used compressed air to clean it. However, upon putting it all back together it seems to be having issues every time I try to use my external monitor or play a game.

Both things resulted in the CPU going from below 1% to near 70%. I’m thinking maybe a shorted something out or maybe blowing the dust further under the logic board… I’m at a loss. Anyone have any thoughts as to what might have happened? Everything else works fine.

I should add that I did a big system update the same day this started happening. I’ve since noticed that my MacBook starts up with high fans and high CPU but then settled down when everything loads. I also noticed my CPU kick up when scrolling preview. It’s so weird though because I can have preview running and everything is fine but as soon as I’m scrolling through a PDF on preview the CPU starts throttling.