After I root my phone to uninstall some not used apps, my phone failed to reboot and stuck, it seems that I uninstall some system apps by mistake. my phone model is sony Xperia t2 and my android version 5.2 how can I fix that ? note that the power button is not working on my phone
if your phone is still able to display boot logo, that's a good sign that the bootloader wasn't corrupted;I suppose that you accidentally removed a program ("init", "surface flinger", ...) necessary for booting the user space environment.
I guess you're still able to boot into bootloader mode; if so, just load a fresh firmware (a.k.a ROM).