Power Button Blinks Yellow

Below you will find my recommendations for troubleshooting this issue:
1. Reseat the power cord and verify a good power source.
To reseat the power cord, follow the steps below:
1.1 Power down the system. 1.2 Unplug the power cord. 1.3 Wait approximately one minute. 1.4 Reseat the power cord. 1.5 Verify that the power cord is plugged directly into a known good power outlet.
2. Verify that the monitor is receiving power from a known good outlet and bypass any power strips.
To test the power outlet, perform the following steps:
2.1 Unplug the monitor power cable from the power outlet. 2.2 Plug in a different device, and verify that the device is operational. 2.3 If there is no power try another outlet. Remove any power strips and try plugging directly into the main power outlet.
3. Verify the monitor is powered on and the power button is engaged.
Ensure that the monitor is powered on and that the power button is fully engaged. To do so, check the power LED on the front of the monitor; it should be lit.
NOTE: There are two types of power switches: A mechanical switch characterized by a long travel. You have to push it further and you will hear an audible click. An electrical switch that has a short travel and almost no click.
A lit monitor LED can be any of the following:
* Green * Blinking green * Yellow * Blinking yellow * A combination, such as alternating green and yellow
Any of these states indicate the monitor is receiving power and that you should proceed.
4. Swap power cables.
To try a known good power cable on the monitor, follow the instructions below:
4.1 Turn off a working monitor. 4.2 Unplug the cable from the back of the working monitor, and unplug the cable from the wall. 4.3 Unplug the cable from the monitor in question. 4.4 Plug in the cable that came from the working monitor.
5. Run the monitor self test.
To run the monitor self test, perform the following steps:
5.1 Power off both the computer and the monitor. 5.2 Unplug the video cable from the computer or video card. 5.3 Reseat the power cord to the monitor, ensuring it is plugged into a known-good outlet. 5.4 Power on the monitor.
NOTE: The monitor self test will move around on some monitor models. If the monitor self test moves, allow it to move to the affected areas of the monitor to check for the problem described.
If the Self test failed, it's possible that the monitor is faulty. Contact dell to check if it's still under warranty so they can replace it.

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