My mac desktop computer won't turn on how can I know what's wrong with it?

It won't make the start up noise at all. Also the screen won't light. All I hear is a click noise when I click the power button. I've tried connecting it to other power outlets yet it still won't work?

Michelle ~ Welcome to the Support Communities. This Apple doc may help:
Troubleshooting: My computer won't turn on
...Found by searching Apple's Knowledge Base HERE.

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