Why is my phone not turning on?

I recently got a new battery for my phone because the previous one was malfunctioning. I also was using a USB charger for my phone which was plugged to my laptop. After sometime of using the charger to charge, my phone's screen would become a different colour and as well freeze, so all i would do was simply unplug the charger press the power button to but the phone on sleep mode and replug the charger and continue using the phone. Now last night I went to a party and came home to find my phone's battery life to be dead. So i did my normal practice of plugging the charger to my laptop and charge the phone. Before I closed my eyes to sleep I saw the battery and the little green line to the bottom signalling that the phone is charging. When I awoke this morning to turn on my phone, my phone did not. After using a wall unit and placing the charger in the wall unit to see if it would have started the phone the same reaction occurred. The phone refused to urn on even after using different usb chargers and wall units. I even took out the battery and placed it back in and the same reaction. So my question is why is my phone not turning on? CAN SOMEONE PLEASE HELP!