How to set the Razer Goliathus Extended Chroma color when I turn on/off PC?

That is Goliathus Extended Chorma default lighting. Synapse 3.0 and its peripherals work via the followings

• Cloud / Internet based connectivity
• Constant back and forward connectivity between Synapse and its peripherals

If the computer enters the sleep mode or Synapse 3.0 is not running in the background the connectivity to the peripheral stops. Which is why it is displaying the Rainbow colour. My one does the same as well. Current Synapse 3.0 cannot change the default lighting But maybe RAZER Synapse team can develop a new feature that can change the default lighting~~~ Or a third party application out there that can help~~~ Who knows

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