Why is the power button blinking green when I connect it to the power

When I connect my desk top to power supply it will not turn on, rather the power button will continue blinking just like

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What does the light normally do?

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Hi @brightonlu62059

A blinking green power light usually indicates sleep mode.

Try pressing and holding the Power button operated for ~10 seconds and then release and check if the PC turns off.

If it does try turning it on again in the normal manner and check what happens.

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