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Need to know how old a computer it is as over the years the power supplies' use different methods of starting.
On newer computers the power supply is connected to the mother board by a 20 or 22 pin connector. The power button on the computer is just a momentary switch to start the computer. Make sure the large connector is firmly seated in the mother board. If you are comfortable with doing that have someone else check it. You do not want to damage the connector or mother board. You need to have some sort of anti static device conntected to your body to avoid any static discharge that could damage the mother board.
Try to check the power supply, if the fan rotates as you turn it on, the try to open it and look for the motherboard capacitors there maybe some leaks on it. but if you have a spare or extra power supply try to change it. maybe you power supply brokes.
well if u want see your fans working without connecting the power supply you can short the green wire (pin) with any ground (black) to see your fan work.....
use a pin or a piece of mettal to short green and black pins
THANHTHHP, memory is very important to start computer.Some cpu's need a minnimum [a pair] 2 memory sticks Do not plug the power supply ONTO the mother board. Do plug the a/c power cord in back of the power box, turn it on.Does the fan turn on [spin] and u feel air coming out? If fan is on, that is good. If fan is NOT on, that is not too bad because some power supply NEED to connected to the mother board for it to have a path.The power supply can SHOT DOWN if connected wrong or there is a short on or in the mother board. Look to see if ANY piece of metal, one of your screws fell in between metal contacts.,Did u put the computer together yourself? Look to see that the contacts [under the board] are NOT shorting where the screws that hold the mother board down to the chassie body
Could be either one, or it could be the toggle switch.
Start with the easiest first to check. Unplug the power toggle switch from the mainboard and take a screwdriver or something and short out those two pins to see if it starts the pc. if it does, then your pc case switch is just bad.
If that's not the problem, check the power supply next.
Jumper the ATX 20 pin power cable's green wire to any black, just to make sure the power supply is working. The fans in the power supply will turn on along with anything else hooked up.
To jumper the power supply use a section of wire or a bread twisty (with the insulation removed from the ends) and just connect the green wire to any black wire on the 20 / 24 pin power connector. Make sure that the power switch on the back of the power supply is switched on.
If neither of those seem to be the problem, then most likely it is the motherboard or the processor.
remove ur power supply socket from the mother board short the pin green and black in the connector if the smps start no problen with the power supply then the problems lies with ur mother board wiring or fault in your mother board if your mother board has secondry power fix it correctly to mother board sock et with has 4 pin if its not working cousult a chiplel engineer the fault lies in the power supply of the motherboard
please remove the power supply pin from the mother board short the pin witres colured green and black if the power supply is working then there is no problem with the power supply check ur memory card to if the pwoer supply is working iff its ok and still not working contact a chiplevel engineer to correct the mother board as there is problem with powersupply section in ur motherboard