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I can just provide you the link where you can check the prices and the model itself. upgrading the power supply you can actually do that. specialy when you are not going to load hardware that has heavier power requirements then that's the time you need to upgrade the PS. Don't forget to get the model of the PS that you have. You can also visit any local computer shop. they can help you with this.
unplug the power cord from the power supply on the computer, wait 2 min. plug back in and hit the power button...if the computer does not turn on, then the power supply has a short in it or a bad fuse.....you would have to either replace the power supply or the fuse inside the power supply...i would just get a new power supply....
If there are on LED lights on in the front panel then either the power cord is faulty or the switch mode power supply is faulty.
Try a different power cord to determine if it is faulty.
Can you smell a burnt electrical smell from the fan grill at the switch mode power supply?
The only way to test if the switch mode power supply is to remove it from the desktop computer and take it to your friendly computer shop to get it tested.
If you do have electronic knowledge I would advise you not to attempt to test and try to repair this power supply.
If the switch mode power supply is faulty, then replace the switch mode power supply with another unit with the same or more wattage.
Had the same problem after the electric went out due to a storm. When the electric came back on the computer wouldn't turn on. There was a light flashing on the Power Supply and on the mother board. I disconnected the large white Power connector from the motherboard, waited 15 seconds and plugged the connector back in, the light came on solid, press the on/off switch and the computer booted up and continued to work fine.