One thing that modern appliance computers don't have is a dust filter. Most people wouldn't change them anyway, so I suppose that is why they are not there. I lost a power supply to overheating on my old 6116CD PowerPC some time ago. That filter was inaccessible without physically removing the power supply. As most of us here function as the local tech experts, we should be sure to remember the basic support function of keeping the equipment clean. Dust is a big killer of electronics of all types, so clean out your computers, stereos, TV's and other devices from time to time.
[robg adds: Warning: A reader has emailed me that using a vacuum can be very dangerous, due to static charges that can build up. Instead, use a can of compressed air...]

