Nice feature- when the set is turned off you still have a great looking piece of furniture. If you prefer go to the menu option to turn the light off
I Have A Blue Light In My Samsung 42 Plasma TV ..can Anyone Tell Me What That Could Be?
This is pixel problem and you are facing blue light due to damage pixels. You should get it repair before your television goes totally dark.
The plasma has lost the ability to work with the pixels to make the needed color in that area. Www.tech-faq.com/plasma-screen.shtml