S4 mini (i9195) looks dead

HI guys. I need your help for my wife's S4 mini.
My wife was taking some photos (approx 40) and the battery was at 80%. She put the hpone in her pocket and when she took it out 30 min later to check the time, the phone was dead......
Power button didn't respond. took the battery out and back in, nothing. removed the sd card, nothing. removed the sim card, nothing. (checked the sim card in another phone and works ok)
when i charge it there is no battery image in the screen as described in the manual.
While charging, if i long press the power button there is a short vibration, but nothing more happens.
Connected the phone with my laptop. i got a msg that there was a software installation (like when you connect a new flash drive), but i can't "see" not even the sd card.
At this time, there is a vibration in the phone and sound from the laptop if i long press the power button of the phone or i remove the usb cable.
Any ideas guys?
i will take the phone to service centre, but i really need these photos today....
Thanks in advance guys....

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