HTC One M9 screen showing white circle? Nothing else?

[Sinclair11]

My HTC screen wouldn t turn on yesterday, I thought it was just dead. When I got home it still wouldn t turn on. i held down the volume down key and the power button, and the screen however it was just showing loads of these bars vertically down my phone (nothing else) and then would fade. After several turns trying to do this it came on to HTC symbol, however it then stated turning green and wouldn t work. Another few times it became a white screen with a black rectangle. I left it over night. It was like that this morning. Tried again and now it became black background with a white/green oval/rectangle (like something out of the ring. Anyone came across this and know what to do???