sounds ,like its end of days and needs to be replaced , if you cant even get to rommon theres not much you can do to troubleshoot ,bad sign when system is amber
Fault Indications
Check the following symptoms to locate or eliminate faults in the power and cooling systems:
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With the power switch on, what color is the SYS LED?
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If the LED is steady green, the router is receiving power and is functional.
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If the LED is amber, the router is receiving power but is not functional.
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If the LED is off, check the power source and power cable.