Screen is stuck on Blu wont power on

The phoned worked well the night before, I turned it off, put it to recharge the following day, when it was turned on the screen is stuck on BLU it wont power on. I tried to hold the power and volume

up buttons together, sometimes the reboot menu comes up but is stuck there. I took the battery from the phone and then replace it, but the same thing happens. I had noticed that some apps were unresponsive prior to this happening, but I was not too concerned as I knew I had limited space. outside of that, The phone worked okay. it would power on in seconds.