I bought a 56 inch Samsung TV 3 yrs ago, after the first 1 1/2 the TV started to act up and start shutting itself off intermittently. So after a few weeks the TV would shut off and then I would have to wait to turn it back on or unplug it and turn it back on right away. So I wasn't sure what to do then it got worse so I packed up the TV for almost 6 months and left it alone. Well my Friend came over and told me to buy a bulb for it so I did, He replaced the bulb and Presto the TV worked great, then he told me to buy a spare bulb so if it ever happened again i could change it an be ready to watch it again without waiting on a bulb, Well i should have listened to him, because two weeks ago, I was watching TV and I heard a loud Explosion and my sound was working but my picture went out and i heard a loud horrible noise every time i turned it on, So my guess was that the bulb went out again. I was hoping anyways, So i ordered a new one seeing I didn't listen to my Friend and waited for a few days, it came in and I replaced it the old bulb shattered, and again I turned on the TV and it worked just like new. I was happy, Well three days later I was watching TV and the TV shut down and all three lights on the front would start Blinking. so I would shut it off and turn it back on and watch TV, after a day or so it got worse, the TV would go on and shut off in less then 2 mins. I could not keep it on, So I went online and started to research the internet to see if anyone was having the same problem, Well This is a common issue for D LP's from samsung. There is alot of problems with a Blue switch that won't stay down when you open your side panel and change your bulb, so I checked it out, i taped down the switch like so many people out here said it fixed there TV and nothing, the TV wouldn't stay on, so I resorted to checking out other positions of the switch and still not staying on, after a few hours of cleaning the dust out of the TV which should be done once a year if you ask me, I decided to cut the switch wires and wire them together, Hoping that works, Well still nothing, so i researched more on the Internet and came across the timer that needs to be reset, not thinking that could be it, seeing it was to simple of a solution, and by the way I'm a computer tech I build and fix all types of computers, it didn't make sense to me, that it would cause it to keep shutting off, Well I researched the code on how to access the service menu on the TV, Which is easy take you remote control with the TV off and and hit mute + 182 + power and wait a few secs, after it turns on you should see it, find the lamp reset and clear it, may say lamp clear, when done turn off the TV and go back to the service menu and check the lamp hours, mine had 66,000 hrs. on it. once i cleared the hours and turned off the TV and re powered it back on Its working just like new. haven't had a problem yet, So when you replace the bulb make sure you reset the lamp timer, may save you headaches and also there is a security feature for the TV if the hours get to long, the TV is programmed to shut itself down for safety, I hope this helps people out and remember if you did reset the timer when you changed your bulb, and it won't stay on, try taping that blue switch down and close the panel that should be the problem, a lot of people have spent hours on tech support and many dollars on parts they didn't need to still have the same problem. And them fix it for free when they learn, If you need help and want me to try feel free to respond to this I will do my best to help you out.