If you have important data on your iPhone while it has problem turning on, try Reiboot, it deals with all kind of iOS issues. Download https://www.tenorshare.com/products/reiboot.html?utm_source=Tenorshare_en&utm_medium=TenorshareOfficial&utm_campaign=ReiBoot&utm_term=1NNnuBuNkUk

ReiBoot fixes following iOS issues: iPhone black screen, stuck on apple logo, recovery mode, DFU mode, boot loop, iPhone won't turn on, etc
One-click exit/enter recovery mode, 3 repair options: Standard mode, Advanced mode, DFU mode repair.

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