My IPhone 4S screen is flashing?

The Wi-Fi wasn't being connected properly, so i turned of Wi-Fi and turned it back on again, that didn't work.
I tried turned off my phone and turned it back again, still didn't work.
Then I reset my phone. But when I turned it back on, the screen was flashing.

Can anyone help me please?

Try a hard reset press both your button and your lock button at the same time until your iphone powers off and powers back on. Which should resolve your problem if you still having problems then I would take your iphone to an Apple store.

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