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@Spxtz I have a Nexus 5 that does that. I'd be interested in what you find out. Internet seems to think it is either the result of firmware upgrade, or a hardware problem with the power button.
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Last night I dismantled the phone and took out the motherboard, soaked the power switch in isopropyl alcohol and operated it til it clicked properly, let it dry, dusted the whole thing and reassembled - and it still didn't work.
So I hit it on the table a few times, aiming for the back panel between the camera lens and the power button, then plugged in the charger and mashed the power button like I was playing Metal Gear Solid*, for about 3 minutes. This was successful! I'm writing this reply on my N5. I can only think that it was a combination of the cleaning and bashing that did it...
*The bit where Snake needs to survive torture. Both of these steps are proposed as solutions by commenters on various threads on android product forums.
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@Spxtz I have had the problem with my first Nexus 5. Later it turned to a brick and was exchanged by Google for a second one, then a third, all of them because of this problem. It is a hardware failure of the power button. You can try to smack it on the side quite hard...
In the end after 4 Nexus 5 between August and now, Google has decided to refund me completely - so I have 400€ back to spend on a new phone. I'm almost decided for Moto X Style, but I like the 5X too. Opinions?
Right, so my Nexus 5 (running latest marshmallow) has gone into a boot loop - it doesn't come on without the power cable attached, and when the cable's in it boots as far as the Google screen (first screen) and then crashes. If I try to get into the root menu by pressing Vol- and Power it crashes from there before I can select any options.
My suspicion is that the power switch on the motherboard is stuck, so I'm going to dismantle it and take a look when I'm home from work, but in the meantime does anyone have any suggestions? At this point I'm just keen to be able to recover my recent photos etc that hadn't backed up yet.