What causes a blinking green Power button light?

A blinking green power light indicates that the printer is processing an operation or initializing settings. Wait for the lights to stabilize indicating completion of actions (Page 1)

From the official HP Laser 1000 Printer manual, page 1

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Why is the power button blinking green on my HP Laser 1000?
A blinking green power light indicates that the printer is processing an operation or initializing settings. Wait for the lights to stabilize indicating completion of actions (Page 1)
How long should I wait when the HP Laser 1000 power light is blinking?
A blinking green power light indicates that the printer is processing an operation or initializing settings. Wait for the lights to stabilize indicating completion of actions (Page 1)
Is the HP Laser 1000 ready to print when the power light is blinking green?
A blinking green power light indicates that the printer is processing an operation or initializing settings. Wait for the lights to stabilize indicating completion of actions (Page 1)

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