If you register online and you're a U.S. customer, you can get an additional 3 months of warranty coverage on your product.
You can do that here:
I don't know if your unit will be covered since opening the unit usually voids the warranty, but see if they will help repair your unit after you register online by calling 800-SAMSUNG.
I have a Samsung LN40A500 purchased about 14 months ago. My problem appears very similar to many others but is just a little different. While watching it the other night it powered down by itself and the red light on the power button started blinking steady. Attempts to turn it back on didn't do anything - no noise, no change, no picture, no sound. The light continued blinking steady until we went to bed. In the middle of the night we heard the power-up tone and it appeared to be working fine. Shut it off and went to bed. The next morning it turned on fine, no noise, no delay. After about 20 minutes it started screeching and the picture became green "noise." We powered it off, gave it a few minutes and tried again. This time it worked fine for about 30 seconds and did the same screech and green screen. Powered it off and let it rest and it would not power back up and the red light resumed blinking steadily.
I checked the capicitors as recommended and they all looked fine. I went ahead and changed out the 2 25V 470uF caps with 35V 470uF caps since I had already bought them. Plugged it back in and same thing - no noise, no clicks, no picture, no sound, just a steady blinking red light.
Can someone please offer suggestions on what to try next? I have NO electronics experience but can figure most things out if explained well (like the capacitor replacement was on this forum).
Thanks for any help you can offer!