This set shipped in 2001 so have your TV tech open it up and dust it out and check all the fans. The tech will take care not to get dust in the light engine but it sounds like heat. Given the age it's a safe bet it needs service.
i have a Samsung model HL-R5067W , the video shows how my TV begins to mess up, and I turn it off, and try to turn it on but it makes a huge fan like sound about 3-4 times, and then the front button blinks 2 red one and one green, and can't turn it on for about 15 min then i'll get normal screen, but after an hour or so it repeats itself.
https://www.youtube.com/watch?v=gOypZ4Am-RU&feature=youtu.be

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