I use a utility software to  monitor the speeds of rotation of the fans, I noticed that the system fan is much slower than the CPU fan, is this normal? The speed of the system is much lower yet the ambient temperatures are quiet high, There has been instances where the computer shuts down unexpectedly, could this be the course?
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According to the references I have done so far, the speeds of the two fans, CPU & system, need not to have quite similar rotation speeds. Also it is the CPU fan that should have a fairly higher speed since it has to cool down the tiny chip inside, which does the full workload of the computer and is easily over heated.
But any of the abnormal sounds coming from the computer or a high squealing sound could be considered as indications of a fan malfunction.
However modern day computers will automatically turn off if any of it's inner components gets overheated. Usually, the heat of the computer may be raised up in excess as a result of over working as when playing computer games which are graphically intensive.
Similarly, the presence of foreign particles like dust and dirt has the capability to prevent proper air supply to the internal components which may lead to overheating and if continued further, may result in sudden shutting down of the computer. For this, you can clean the inside of the system unit, but with care!
Also you can check the processor`s heat sink in order to make sure that it is not dislocated and has a proper supply of thermal compound in needed amounts.
Furthermore, if all these steps prove to be useless in solving your issue, it is worth considering that the presence of virus and other malware attacks, OS issues, failing hardware components (including the problems with UPS or surge protector) or any other issues like a UPS overload or UPS drivers reporting bad power situations may also cause your computer to shutdown suddenly.Â
