Mac Mini auto shuts down shortly after startup chime...what should I do? Thanks.

Our boss brought a mac mini model A1176 from the US to be used by her staff here in the Philippines. We powered it up- everything was working. Then it just stopped working after onen day. Whenever it is powered up, the mac mini auto shuts down shortly after the startup chime. What's wrong. How can we fix it? Thanks a lot.

Troubleshooting: My computer won't turn on
Mac doesn't boot

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