My sister has that Laptop, gets problems all the time, I don't really rate Dell computers as much as I used to. I'm pretty sure she had that problem due to overheating as dust had collected in the fan so it wouldn't rotate, open it up or give it to someone to do, give it a clean and try again, also make sure it is not covered on the underneath like when you put it on a bed or cushion, have it on a flat surface to prevent it heating up.
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