Noisey old computer

[Spycam]

My PC is a few years old and although it works well, it had recently become very noisey. I opened it up and started it up for a few seconds with the CPU fan unplugged. The noise stopped. I unscrewed the fan and took it out. Pealed off the round foil to get access to the center spindle the dropped a few drops of switch cleaner spray. Gave the fan a quick run while still out and all was quieter again. Put everything back together ( I was earthed while working on it)and all is quiet.

Hope this might be of help.