my i10 won't turn on

[kotenok]

Hello to all. So, I listened to some music in my car, powered off the i10, went outside for 5 min, got back to my car, wanted to turn it on, and it didn't respond to anything. Battery was completely full. I have it for 4 months, never updated a firmware (using the original 1.03), never dropped it, nothing. Came home, plugged it to wall charger - the screen is black and doesn't respond (usually when I charge it via the wall, I have a writing on the screen saying "charging". Now, nothing). I tried to connect it via the usb port, the screen is black, and i hear the sound of usb device not connected (win 7. never had a problem with connecting before), and I get a balloon with usb not recognized. I tried to soft reset with the volume buttons and then power it on - nothing. I am so sad, don't know what to do, and the sad thing is that I didn't do anything to the device Does anyone have some advice? Thanks