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Did you checked the above suggestions? have you tested a different SIM card?
My XperiaM4 Aqua is unresponsive, attempts to turn it on result in a white screen with the Sony text logo. from that point on it does nothing. I attempted to remove the SIM card and MicroSD card , have re-inserted the SIM card with the same negative results. Is there a Do It Yourself fix ?
To complicate matters, the problem seems to be the result of my attempt to re-install the system as the Xperia Companion was not recognizing the phone. A system program download also failed, when I tried to use it to repair the phone's system which brought on the white screen problem. Ferom that point on, I am stymied and unable to get the adroid system up and running . Please advise?