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Whoaa. Sky said that there was "grinding". That can't be caused by drivers, or chips, or whatever. It's mechanical. That points to either a fan or a hard drive. I'm betting fan. If it's choked with dust you will hear it beating against the mat of dust. Open it up and vacuum it out. (Or blow it out. I know one guy who uses a leaf blower.) Be sure to get any heat sinks too.
If it's a hard drive, back it up right now. It won't make noise for long before it dies.
JMO
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