Why can't I access recovery mode anymore?

I had an issue with my phone saying iphone disabled connect to itunes, when I did it told me to update my iphone 6 software with a 2.85GB update to restore my iphone. When I downloaded the software update and updated my iphone using itunes on my laptop, suddenly after the installation my iphone went completely black no wallpaper. The only writing I could see are the words “iphone disabled connect to itunes” with a blue highlight moving sideways. I tried to do a hard factory reset but it doesn't show the turn off button anymore and I can't seem to access the factory reset mode anymore. Please help im frustrated. Thank you.