Power Mode...I know this has been asked alot :/

[Crysis]

I know this topic has been posted a lot on this forum and I apologize for it, but it has been bothering me to know if the power mode makes a big difference in accelerating. My power mode light comes on when I start it and shuts off right away without blinking, however it does not come on when I stomp on it. So the questions are, is my power mode malfunctioning? Is it worth fixing or is the performance about the same without it? If anyone could respond it would be great. Sorry for the repetition of this topic. :/