I guess u r a professional..as u r handling power supplies..
u point of view has always a priority, in such case u gotta replace the fan..
however, the problem of system shutting down suddenly has many more reasons too..check the following:
1) the smps itself may b defective/faulty..check the outputs of smps
viz. 0v (black~ground); +12v (yellow); +5v (red, green~ps-on, violet~pg
& grey~sb); -12v (blue); -5v(white); +3.3v(orange)..
the 'oscillator and error amplifier ic', or
pwm switching regulator circuit..look for defective
protector-transformer/resistance(esp 4.7k)/mosfet..
2) if
itz not the smps, then it must b ur main/mother board..see with a debug
card for mb error..may b short..look for defective capacitors(esp above
1000mfd)/mosfets..go through the mb's south bridge n the circuit lie
around atx connector....
3) remove/clean dust neatly..dust is non-uniform in nature n may cause jam/short circuitry/excess resistace n many more..resulting an increase in heat..
4) open the CPU Heat-Sink with fan out of the socket..put some "Heat Sink
Compound" (available in local electronics chip level spare market)
between the cpu/processor and the CPU Heat Sink *** fan..resit/fit it
tightly in position..
5) see if the ram(s) is loose/faulty..open clean/remove carbon & or oxide formed on the teeth with an eraser n resit it..
..plz give higher priority to step2 (as listed above) CAREFULLY..
always better to seek advise from ur system admin/vendor....
Testimonial: "The fan is OK, checked on seperate PS. Good thoughts though!"
Disconnect all devices from the power supply EXCEPT the motherboard
Remove any extra cards including video etc.(plug monitor into the onboard)
If you hear any beeps these can indictate where the fault is.
either of these sites below will help you further with that
Beep codes Pc
More beep codes
Power up the pc and see if the fans are working.
If not then double check the power connections to the board.
If you still have no fans it is time to suspect the power supply as the probable cause.
If the fans worked then you should have gotten a display which told you there was an error and offering you a chance to go into the BIOS. ignore it and shut down the PC.
Now connect one drive only and boot again.
Repeat that until you identify the component that is giving you a problem.
Once you find the problem then remove or disconnect and carry on with the rest to see if another component might also cause a problem
If there is only one problem device then you may want to investigate that device further, Unless you don't mind replacing it
Sometimes the fans are replaceable. If there is info on the fan regarding voltage, rpm and CFM (airflow) it may be possible to order a similar fan and replace the defective one.
http://www.geeks.com/products.asp?cat=FAN This link is one of many sources for computer fans. I have purchased several items from them over the years and I have nothing but good things to say about them.
Power supplys aren't terribly expensive so it is your choice to repair or replace. I would probably replace it if it were mine. If you choose to repair be sure not to make any mods to the power supply as this could pose a fire risk. Also be aware that there may be stored high voltage in the capacitors and you could receive a pretty good shock if you are not careful. You can short across the leads of the large capacitors to discharge them (make sure it's unplugged!)
Hope this helps you.
Bob
You have to check with the fan fixing , the fan should be fixed properly to the motherboard, check whether the fan is seated well in the locks. dont forget to vote, Thank you
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