|Please explain how you cleaned the computer. I suspect that if you ended up unplugging a power connector, you probably used a vacuum cleaner. If you did, it may not be good. Aside from the obvious issue of bumping things, pulling out connectors and possibly wires from connectors, there is the problem of Electro Static Discharge (ESD) to components which can be very bad.|
Did you remove any components?
Did you remove your CPU's Heat Sink? If yes, did you remove all of the old thermal compound and replace it properly?
Answer these questions, list all of your components, and examine your system inside carefully again with a strong light for anything loose, unplugged, or damaged.
You have to be a little bit crazy to keep you from going insane.