I've got a 470w psu with in my current system, and recently, random USB devices just fail, like my keyboard, or mouse, even printer, until I plug them into a new usb slot, which sometimes doesnt work. I noticed that when I unplugged some stuff such as lights and extra case fans, the system became more stable but still is not 100% working. Do I need a bigger PSU?

...Now that I'm thinking about it...when I was replacing my heaksink, Asus had this stupid piece of **** glued to the back, like a mounting plate, but not, and I had to pry it off with a screwdriver. In the process I kinda kicked the bottom of the mobo up, specifically one of the wires going to the processor, but the connection is still intact.
Any chance this is the cause?