Phone cannot turn on, cannot charge and is recognised as a USB

I was on my phone watching youtube, then the phone went black screen and turns off (its normally usual to do that on my phone) but normally it would reboot... this time it didn't. I have used both batteries, above 50%, i have also tried charging the phone without the battery. The phone will not react, no LED or nothing. This problem happened once but it later turns on. The phone won't restart, go in command prompt or factory reset. My phone is rooted so I have no warranty. What can I do?