Power problems

hello, my computer was working fine about a year ago before I deployed. I returned a year later, brought it out, and tried turning it on but now it won't stay running! the power tends to just turn itself off either immediately, or about a minute later. what could cause that and what can I do to fix the issue? Hoping at worst I just need to replace the power supply
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  1. You gave us no info about your system.

    Check for any obvious signs of damage.

    Unplug and replug all the cables.

    Check the CMOS battery, it may have died and you lost your bios settings.

    It is possible the power supply went bad, but I would basically rebuild it first just to be sure its not something coming loose (power cable, CPU heatsink, etc).
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