Z5 Premium not turning on

[BlazeAwesome]

My Xperia Z5 Premium won't turn on.

I've pressed and held the power button. Didn't work. The hard reset is not working. I tried pressing the off button near the SIM and tried turning it on again. Didn't work.

Also when i hook it onto the charger the notification light doesn't light up. PC Companion isn't recognizing it either.

Please help!

[AlfieTitu]

Hi @alexdon,

Thank you for your advise. but I have got another issue. My phone is password/finger print locked and when I tried to connect with Xperia Companion, it is saying your phone is locked and need to be unlocked. How can I can unlock when my phone is not turning on.

Could you please advise me if there is any alternative way to bypass this. 
Thank you in advance

[baxdvd]

I had an issue with my Z5 Premium not coming on. I tried to charge it repeatedly and press the power button as well as the yellow button above the sim card slot in all sorts of combinations to no avail.

Turns out the cable connecting the battery to the phone had mysteriously disconnected. I fixed it by prying open the back just enough to reach the battery cable. Using a matchstick, I pressed the cable firmly into place. The back stuck back on, but it's probably no longer waterproof. If you're out of warranty, it's cheaper to pay for the back to be resealed than to pay someone to just reconnect your battery for you.