Generally this indicates a failed power supply. There is also a slim chance that the motherboard could be bad, but 85% of the time, it is the power supply... Excerpt from the Service Manual:
Blinking amber:
- A power supply or system board failure has occurred.
- Check the diagnostic lights to see if the specific problem is identified. Also, see "Power Problems" in your computer
Owner's Manual.
Link to troubleshooting section of service manual.
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