Help Virgin Mobile Galaxy S5 won't boot!!

[hanginghelmet]

I have a Samsung Galaxy S5 from Virgin Mobile. While looking at the Twitter app today my screen froze and there was a line across the bottom of the screen. I had to pull the battery and now the phone will not boot up. The phone will just vibrate and the blue light in the top left just blinks but the screen will not come on. I have tried starting it by pressing the power button and home screen button together and then by pressing those 2 buttons with the volume up button but the screen will not come on. Can anyone help??? Up until I have hade zero problems with this phone.