Does this happen when plugged in? Seems like you're not getting power. The other,more probable problem is an overheating situation. Make sure all the fans come on,there's 3 inside. It may need a fresh coating of thermal paste on the cpu or video gpu or both.You'll probably need to take it aprt to find the answer & that is way too much to type. Go to www.dell.com for a detailed exploded view of the laptop.
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