Poor response to Power-On button

In the last two weeks, the response to pressing the Power-On button have been inconsistent.
Frequently, when I depress the button, there is a single click sound, but the small light just above the power button doesn't illuminate, and about two seconds after I release the button, there is a second click. Nothing else seems to occur.
If I hold the button depressed, nothing seems to occur, and there is a second click heard some time after I release the button.
After perhaps going through this routine three times, the (correct?) response occurs: There is a click and the light illuminates as soon as I depress the button, I release the button promptly, and the computer goes through a standard-appearing start-up.
Today, I had to try about seven times before getting a start-up response.
Is this something I should be concerned about?
Best regards (and thank you in advance), Isshi.

Some anecdotes about USB devices that draw too much power come to mind. As an experiemnt, try disconnecting as many USB devices as possible, and try to start up. If the results are different, you may have to change what is plugged in the back (with a 1500 milliamp budget) and the front (with a 1000 milliamp budget) or look into getting a powered Hub or using a Hub in a display. Don't even think about the ports on the keyboard -- they have NO extra power available.

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Poor response to Power-On button

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