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Guides for repairing the Dell Optiplex 790

Why power button blink orange light

Why power button blink orange light

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Hi @abdulhadi96018

Check which diagnostic LED lights 1-4 on the back of the computer are on as they will tell you what the problem is.

Go to p.73→p.75 in the owner manual to see all the combinations and what to do.

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An orange light typically indicates a power delivery issue or an internal hardware failure preventing the system from starting. Unplug everything (including the power cable) from the computer and press and hold the power button for around 20 seconds until the pc drains of power. Then, plug only the power cable in and see if that fixes it. If it doesn't, then you can try to see if your PSU is the issue. Locate the small button and LED light next to the power cord inlet on the back of the computer. Press the button. If the LED is solid green, your power supply is perfectly fine. If it remains unlit, or it blinks, your PSU is at fault, and you should replace it.

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