between the CPU and the HSF??? Did you???
Started up computer, (old Gateway DX model with AMD Phenom II quad core) weird noise emitted from fans inside. Unplugged everything and opened up. Fan was clogged with dust. Removed processer fan assembly (processor stuck with heat sync) and used a vacuum to clean out the dust on the fan and around other areas on the computer. Placed everything back exactly as it was before. I pressed the power button, and the fans ran instantly, but no power status light came on and no boot up information appeared on the monitor. Any information on what went wrong and what to do about it is greatly appreciated.