When i turn on my pc it will run for a few seconds and then it shuts itself down. then it will not turn back on until i unplug the the power slupply from the main mother board. then i can turn it back on for a few seconds untill it shuts itself off again.
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You can try unplugging the PC, removing the RAM and re-seating it. It could also be a power supply issue, either too much for it to handle or it's not functioning correctly. My first suggestion would be unplugging hardware that's not needed for a week or so and see if it keeps happening with only the HDD plugged in. If it doesn't continue plug one thing in at a time until you find the culprit... although because it does run for a bit when you have the so called culprit, unplug it and plug something in its place, if it continues then you may have over powered your power supply and need to get something a bit larger.
You may also have issues with the PC over heating or fans not running correctly, make sure to check these items while your PC is turned on. (please be careful).
First, press CTRL + ALT+ DELETE and bring up the task manager. If there is no response, you could try a hard reset. Either hold down the power button for a few seconds untill it shuts off, or switch the power button on back of pc off, or unplug the power. Although do this as a last result as you may lose any unsaved data. When you turn it back on it should say " windows did not shut down correctly " and it will give you a few options. Press enter on " Start Windows Normally ". See if that helps.
Open the case, then look for anything that burned out, replace it!!!
If still won't start, you need a multimeter, soldering iron, try locate output diode on power regulator board, then measure the voltages, it has 3-4 type of voltages; first diode it should around 115V-130 V DC. Second diode it should around 24 V DC. Third diode it should around 11-16 V DC. Fourth ( if exist), check diode and should around 5 V DC.
The problems usually start on second diode, if persist, follow the circuit board.
your pc may be set to a resolution that is out of range for the monitor.
Boot into "Safe mode" reset the Display settings to 640 x 480.
reboot into normal mode then change the screen settings to your desired resolution.