I'm very sorry for any inconvenience this may have caused you. Unfortunately, this sounds like it may need servicing. Here's the thread where you can get details on setting that up: http://forums.cnet.com/7723-13973_102-542437/service-issues-click-here-for-help/
I have never had any problems with this TV until now and it waits until my Best Buy extended warranty expires, and I start have the WHITE STARTING to appearing two weeks ago and now I have several. I searched the internet and I found this is something that happens at a regular occurrence.
I have numerous SAMSUNG products and I have never had a single complaint about any of your products.
I sent a question in on the Samsung Support site last Saturday 11/03/2012 and I have not received a reply.
I see where some people have been able to get the DLP replaced for free. Before you ask, I have these same dots in the same locations no matter which source is chosen on the TV.
What are the chances that I could get this DLP replaced for free????