ticking noise?

best bet is to have computer turn off, then pull side off and then turn back on and let run. then get down or up as the case my be. and look and listen. while your at it if you see lots of dust in your case, on fans,power supply, motherboard etc, you need to clean & its possible dust build up is causeing clicking noise on fans But if this clicking noise is coming from hard drive then you had better get you info. saved as its only a matter of time and it will die.

**note of caution if you must reach in case and do not have static strap keep one hand on case and use other hand to touch what ever. as static can destroy. If you going to clean, unplug ever thing take to cement floor, wood floor any thing but carpet to clean. remember static or EMI as its called can do damage.

It sounds like SOMETHING in your house is on a timer of some sort. It could be anything - a dryer, a wall-timer to turn a lamp on or off, a phone message machine - anything. I'd try walking toward the tick; if it's every ten seconds, then try to take a step, wait for the next tick, go in that direction a step, wait for the next one, and so on. Good luck - I know what you mean - stuff like that makes me bonkers!

May be a bearing going out in one of your fans