I would recommend having the unit serviced.
If you're still under the warranty period, you can call 800-SAMSUNG and schedule a repair.
If you're less than three months past the 12-month warranty period, you may be able to register your product online and get an additional three months for free.
You can do that by registering here:
Once you've done that, call back and see if you can set up a service then.
If you're past the 12 months and the additional three months, I'd still recommend having it inspected, but it will be an out of pocket expense.
Does that help?
I have a Samsung LN46A850 LCD tv, and for the past few months, whenever I turn the unit on, there is a vertical blue line on the right side of the screen. It goes away when the set warms up, but it shouldn't be there at all. I have tried changing HDMI cables from my cable box, but the lines are there when nothing is hooked up to the tv. Any suggestions are gratefully accepted. Thanks.