In a class for repairing PC's we were instructed to never "let the magic blue smoke out." It is like unto voodoo; when you consider it. Being able to communicate in what amounts to real time or to collaborate with anyone anywhere. And everyone is catching on to what the latest applet is. A word that AFAIK didn't even exist 20 years ago.
It didn't come with a warning label. However it should have. That's a warning to you the user. ;-) Maintain your PC. And remember if it crashes you have to restore the data. If it is critical you must rebuild it. And that should have been tested and shown to work. Shutdown and disconnect your computer and blow the dust out. I do it twice a year. Consider it's environment and adjust to suit. Carefully remove the front panel and remove any collected dust and also the side panel and holding the fan gently but firmly with a finger tip I blow out the heatsink with canned air.
Heat is energy and we wish to conserve the latter. Today's processors are monstrously powerful at even low wattage rates; far outpacing what was the latest and most expensive of computers even 3 years ago. When purchasing a computer common sense choices can save energy and still provide a powerful home or business computer.
An example. Tiffanj is a box built for other users here. It has a 7500 rpm 250GB SATA HDD. The motherboard is a Gigabyte MA78GM-S2HP, Athlon Dual Core 4850e and 2 GB's of DDR2-800 RAM. You could likely find those parts near a $120 today. CPU is rated to 45 watts which is minuscule for the processing power. Though today I would choose perhaps the 705e triple core with 6MB of level 3 cache. A 65 watt cpu and a board with an AMD 785G chipset like the 'Guru of 3D' reviews here. Further if you install a version of linux ..you don't have to buy Windows 7 or any other OS. And most viruses and worms won't work on your system. ;-) How's that for magic?
Maintenance will give you a faster PC that runs cooler and lasts longer; while saving energy.
AFAIK- as far as I know
YMMV- your mileage may vary