This kind of failure is more common due to improper use. Improper use of the so-called is only the wrong operation or bad use of the environment caused. Computers belong to sophisticated electronic products, and the use of the environment is relatively strict even if the technology is now relatively advanced.
Problems described in the problem is due to the ambient air humidity, resulting in memory of the gold fingers and the motherboard card Groove contact part of the oxidation caused. This kind of problem can open the chassis on its own to remove all the memory strips and use the rubber to the memory of the two sides of the golden touch in the same direction a few times rub. Make sure there is no oxide layer, the effect is basically reflective to see the extent of the brightness of the contact point. Do not trust words can be tested.
Make sure the connection is good and not alarm.
The standard of humidity should be: 45%~60% maximum range should not exceed: 30%~80% temperature difference between the best is not too big, one side of the temperature of the water vapor on the motherboard condensation.