Answer for:

compaq evo D510

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If it was powering off while in operation, that would seem to indicate a heat issue. Likely from the CPU heat sink.
If you meant would sometimes power up, sometimes not, then it was likely the power supply.
Since you have replaced the power supply it may now mean the CPU or Motherboard is belly up.

Try disconnecting power from everything except the motherboard and see if it will post.