I was installing TWRP and it was having problems mounting things so i was going to flash a CWM to see if that worked. I was on the fastboot screen. I left for a couple minutes and when I came back the screen was blank and when i push the power the only thing that shows up is a battery icon with a lighting bolt in it. If i unplug it from the computer Nothing happens no matter how long I hold the power button (up to 1 minute). It used to vibrate when i tried to boot into the system or the fastboot but no vibrations what so ever.
Solution: somehow the battery died even though it was plugged in the entire time. after leaving it over night the battery charged and everything was as i left it.