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Disconnect the desktop computer from the electrical power.
Plug it in, while looking at the computer, and listening for any noises (spinning fans, or lamps that light up) as soon as it is plugged in. Then, press the ON/OFF switch, and watch any lamps, and listen for any fans. If nothing, then the power-supply is the problem.
You will have to get your power button unstuck. I do not know what type of button you have but if you would like to at least get your PC on without it instantly turning off, you can remove the power switch connector from the motherboard. You will eventually need to have the switch unstuck, or replaced though.
chek your power unit or the cpu fan working or not if the cpu fan is not working computer will turnoff immediate to save it you better show you computer for technician soon
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Maybe the problem is a faulty power supply. Have you checked its internal circuitry to ensure that everything's connected? Or is it a different problem where it functionally shuts down?
I had this happen to my emachines T1842 about a year ago. I replaced the power supply and it worked fine. It was about 25 bucks but fixed my problem. Make sure the red switch on the back hasnt been messed with. it should be on 115. If you have moved it, it may have blown a fuse inside the power supply.
I would test the memory. Also I think some computers will shut down if the fan on top of the CPU quits working. Or maybe one of the other fans or the Hard Drive quit and is drawing too much juice causing the PSU to shut down. It sounds like something may be grounding.
I got a new fan for my PC, but it was under warranty. Your PC does not know that the fan does not work until it overheats. So, you have some other problem. Try to start it without a battery, just plugged in, if it is a laptop. All anyone else will tell you is that if you get it on, you should reflash the bios. That always is what they tell you. I guess it can't hurt, but if it shuts off immediately, maybe you think you have full power but don't? That's what it is acting like, right? No power.
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