Page 156 of PCA April - 'Prolong the life of your PC - leave your PC running' How can this be? Surely leaving a PC running overnight can do it no good? Plus consuming power resources. What do you lot do?
If your PC and Monitor support 'Energy Saving', then it is a good idea to put the Monitor and Pc into hibernation mode when they are not being used.
I have a Microsoft keyboard, this has a Sleep button. When I press this the monitor and pc power down, if I later move the mouse then everything powers back on.
I always switch off at night though, as I do not want any ghostly spirits to play with my PC!
Another point to bear in mind is that if you are on Broadband, and leave your machine on continually, then you are more likely to be picked up by a hacker. If you are using Sleep or Hibernation Modes, then your computer would not be detected by a hacker.
For those who do leave their PC's on for 24/7, then as mentioned above on the links, it is a good idea to do a complete shut down/restart occasionally, rather than just a restart. This, for some reason, is sometimes more effective if you have any problems.