My Desktop Computer Or Laptop Computer Just Shuts Off.

  If your Desktop Computer or Laptop Computer just shuts off by itself only after it has been on for a few minutes or seconds check your fans. I have seen numerous times where the CPU fan and heatsink are full of dust and debris. If it is a desktop, first disconnect any power to the computer. Open the side cover and check for dust especially in the CPU fan and heat sink. The system is designed to shut down if the microprocessor overheats. This protects the motherboard from damage. The best solution is to use an air compressor to blow out the dust. I would do this outside and wear a dust mask. When blowing out the fans I would hold your finger on a fan blade so it does not spin. The compressor will make the fan spin faster that it should and can damage the fan. Also do not stick your finger in the fan while it is spinning. I have seen people get cut by this. If it still has the same problem test the power supply and check for bad voltages. Also check all power connections. The next step is to replace the power supply.
  Other components to check are memory for poor connections. Try re-seating the memory in the slots. Just wear an esd wrist strap before handling any component. You can also try removing the power from one component at a time to determine if the computer all of the sudden powers on. Replace the bad component. Another popular item to check is the latches on the microprocessor fan and heat sink assembly. I have seen the plastic become brittle and break. This results in the microprocessor overheating.
  If you are working on a laptop then you have some different paths to take. The first thing to check again is the cpu fan. Some laptops actually have more than one fan. I have found many times that the dust balls up in the fan blades and stops the fan from spinning. In this situation the first thing to do is determine if there is a removable panel on the bottom of the case. If there is remove it and then remove any dust from the fan. You can use an air compressor ,but be sure to hold the fan blade so it does not spin too fast. If there isn't any cover then I would remove the keyboard carefully. Sometimes there is a small opening at the fan. You can then blow the air through the bottom of the air vent and the usually blows out of the fan. You may have to use small needle nose pliers to remove dust clumps.
  If this is not the problem try removing all components one at a time. If you remove the last one and still has the same problem, then I would suspect a defective motherboard. Always make sure you are getting something on the lcd display. If nothing check the lcd ribbon cable and try an external monitor. I do not suggest replacing a motherboard unless you are capable of doing it yourself. I have seen too many cases where the part and labor exceeds the cost of the laptop. Plus you do not know how long a refurbished motherboard will last.
  Thank You for reading