Phone won't boot topic

I have dont NOTHING to my M8 I have it rooted and S-ON. I turned off the phone to get into bootloader to check something. I do volume button home at start and the phone is VERY SLOW to open bootloader and finally when it gets there I can only choose fastboot my volume buttons dont work. It does hboot VERY SLOW and it keeps trying to find an image when checking sd card. PLEASE HELP !