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I've had a Z3 Compact for maybe a year or so and it's been fine - no reliability problems at all. I put it on the kitchen side while I cooked dinner this evening, went back to it afterwards and it's completely 100% unresponsive...
Various forums say take the SIM in and out or press power and volume buttons at the same time, Sony forum says plug it into the PC and run the Sony PC Companion but it continues to do a very convincing impression of something that is bereft of life, has gone to meet it's maker etc etc...
Having moved house at the weekend I'm without landline and reliable broadband so to say this leaves me somewhat up the creek is underestimating things somewhat - any idea how I can get this fixed? Ideally without losing all my data or have a service centre keep it for several weeks...
Have you tried holding the power button in, until something happens - hopefully. Approximately 30 seconds.
My z3 was unresponsive the other day so I held down power first, then volume up at the same time for a few seconds. It vibrated and did a kind of soft reset. Didn't lose any data.
Red light of death come on when charging?
My Z1 did exactly this a few months ago, one minute it was working the next it wasn't, it hadn't been dropped or anything. Neither a soft or hard reset could coax any life out of it. I sent it off to Sony UK and they replaced the battery free of charge under warranty. It was a reasonably quick turn around.
Could be that your battery needs re-calibrating?
If you are signed into a Google account, with backup, you won't loose contacts, images, emails etc - at most you would loose texts.
As above, give it a charge and then try a power and volume up button press for 5secs+
Edit:It's not something as simple as battery loose?
Had this a number of times on a T and Z1c
As above the soft reset should sort it.
You may have to hold the buttons for a longer time than expected though.
And it will need charge in the battery, I've had them go from nearly full charge to empty in such instances, so may be worth leaving it on charge and trying it whilst connected.
On a positive note, you own a Sony phone and the screen hasn't cracked. Bonus.