Moto G wont turn on

Hey guys im new here and i need your help! I tried installing CM into my moto g, but it didnt go so well so i flashed stock rom and it worked fine. I tried to update the stock (4.4) to Lollipop and it was showing a progress bar it was going well. I leave my phone there and went to go do something and when i came back to check the the progress, the screen was off. I tried to power it on several times and even tired holding down the volume button but it wont power up. The charger wasn't plugged when it was updating but the battery percentage was over 70%.. I left it there to charge for hours and still wont work. But when i plug it in my laptop it makes a sound that the phone is connected but the screen is still off. When its plugged in my laptop my notification blinks once and thats it doesnt do any thing else. Can someone help me fix this?:(