Six years is doing good. However give us a make and model number, that always helps things along. Have you ever removed the side panel and blown out the dust bunnies. This is the first place to start. If the computer rests on the floor move it up, even a 6 inch block will work wonders as all dust eventually reaches floor level and you disturb it as you walk about. The fans then suck it in. If it is dusty in there buy a bottle of compressed air, remove the computer outdoors (you don't want to upset whoever cleans the house) and blow the dust out. BE SURE to hold a finger on the fan so it does not spin wildly and pay particular attention to the fan on the motherboard. This protects your processor and very likely it is overheating and shutting down to prevent damage. If you live in a VERY dusty environment and it is bad in there then also take a look between the plastic front panel and the metal behind. There is a 3/4 inch space that can get bad. You can also test for heat issues by removing the left side and use a small house fan to blow in on the components. This is not a fix but a temporary measure so you can decide if heat is the issue here. Let us know how that works for you

pcdecrapifier read its name carefully to see what it does. For new computers it selects some of the well known not needed junk you might not want. Plus it lists all programs seperately and offers to remove there too .. but your choice then. Sounds like wifi interfierence or just a bad internet connection. Could be the router. Maybe you have a neighbor with new wifi messing you up... inSSIDer is a handy thing for that.. http://www.metageek.net/support/downloads/ Here is a link that might be useful: http://www.pcdecrapifier.com/download

No, I'm not. It may be cookies. Try deleting cookies and see if that helps. Sometimes goofy stuff happens to one computer and not the other. On the current computer that I'm on, sometimes when I log on to Facebook it takes me to myspace. I delete the cookies and it stops for awhile.

I'd plug something else in that socket with the computer off to see if it's an electrical buzz you're hearing (leading you to think it's the computer). Hold a funnel (large side out) to the wall to isolate location (high frequency is tough to isolate though). You could turn off the breaker for the living room (assuming it's a different breaker) and see if the computer still makes the buzz indicating maybe a loose wire in a socket there (unlikely IMO). Does any socket have a USB port? Could be a high-frequency converter. Switching power supplies (the 'brick' type) can do a hi-freq buzz too.