Mac startup

MacBob2420 Said:

"Mac startup: When I push the power button I hear a click, then nothing happens…. What could be wrong? The fans also spin once so it is getting power."

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Troubleshooting Mac Power:

Refer to the following....

A. Try a New Charger:

• Power & Cables - Mac Accessories - Apple - Select "Mac Compatibility" on the left
• Find the Right Power Adapter and Cable for your Mac Notebook - Apple Support

B. A Few Links to Refer to for Power:

• If your Mac doesn't Turn On - Apple Support

• About Mac Notebook Batteries - Apple Support

• How to Turn your Mac On or Off - Apple Support

• If your Mac Battery won't Charge - Apple Support

• Charge the MacBook Pro Battery - Apple Support

Possibly a hardware issue.

If it’s convenient, take your Mac to an Apple Store > Apple Store - Find a Store - Apple

If not, contact Apple directly > Contact - How to Contact Us - Apple

which model-year Mac Pro?

Has power been interrupted lately?

Have you checked the PRAM backup coin-cell battery?

It should measure 3.0 Volts or higher in your hand. Any less is considered spent.