Why does my dell tower keep switching off after booting up

Hello,
when i start up my tower it boots up but after about 30 secs it turns itself off what is causing this . the previous owner said it was definetly working am i doing anything wrong when i switch on or is there a fault with the tower. thanks
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  1. Welcome to Tom's Hardware Forums,
    There are a few possibilities here, 1) something became loose during transit - check all wiring connections within computer to ensure none are loose. Also, check the heatsink/fan on the CPU, ensure it hasn't become loose,
    2) the PSU died during transit - unlikely but the PSU would need to be replaced or
    3) the seller was exaggerating the condition - PSU would probably need to be replaced.
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