A bad power supply is the most likely cause of the issue, this includes the PSU itself having failed or a bad connection, one thing that does help point more to a bad PSU is error beeps or the lack of any being heard, if the computer normally emits a single BIOS beep when the computer completes POST but you are not hearing one now it suggests that either the MB or PSU has failed but with the recent trouble that you have had starting the PC up at all it points more toward the PSU.
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