Iphone 5c crashed, now wont switch on
I have an iPhone 5C. Last night the screen froze whilst on safari (screen went dim with faint lines across screen). It then switched itself off. It wouldnt let me switch it back on, even though there was still 40% battery. I put it on charge overnight to ensure a full charge, but still I can't switch it on. I have tried the usual attempts (power & home button) but nothing.
Any ideas folks.
iPhone 5c, iOS 8.1.2