Galaxy S2 Crashed - Not Booting Anymore

Jul 25, 2011
Hi Guys...

My SGS2, which had siiyah kernel 4.1.5 and almost the latest miui for sgs2, cant remember
i wanted to unlock my phone, and it hangs at the unlock screen, so i hold the power button to reboot it... it shut down, but never boot up, so i took out the battery and tried to boot it, no success
even in download mode or CWM i cant get access, if i plug in the charger, no charging symbol can be seen...
is my phone now dead, really dead ?