not sure about the noises when you type, but at times my system made noise, I found it was interference from having my harddrive mounted to close to my sound card (stupid mod i attempted). I do have a wireless mouse also and now and then the frequency of the transmitter interfere's with the sound. If you have an aftermarket sound card in your system (ie, not mobo sound) and there are IDE/Power rails/etc near it, try rerouteing them.
or could be your speakers starting to go.
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