RE: Screen flashes frequently after some time
Does the same thing happen when using an external monitor? If so, then please perform a systems diagnostics by either pressing F12 at startup or by using Dell Support Assist .
You can contact Tech Support for additional troubleshooting at 1-800-624-9896 or 1-800-288-4410, or you can initiate a chat session http://dell.to/2v4snVm
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