Device will not power on after battery ran dry?

"Have you tried to reset the charging logic of the device, first you must charge your M8 for a minimum of 10 minutes using a wall charger. With the power off, press down and hold the volume up and down button with the power button for approximately 2 minutes. After 2 minutes, release all of the buttons. After the release the charging logic should be reset. Then charge your phone to 100% using your wall charger. If this doesn't work then its probably a failing battery or charge port.

I am curious what charger you have used to charge the battery. If you are using a generic charger or one that you had from a previous phone it may have caused damage to the battery or the charging IC on the motherboard. This is because the charger is sending the wrong voltage to charge the battery. If you were using the charger that htc recommends then the power IC should be fine, but the battery may still be the cause. If a Li-ion battery discharges to low it usually has a protective circuit built in that will put the battery in sleep mode when it drops below a certain voltage(I think around 2.8v-3v). When this happens the only way to get the battery out of that state it to give it a boost charge. Same idea as jumping a car battery. It needs a higher current for a short time to boost the battery above 3v then you can charge with a regular charger. Anywhere under 3.4v the phone won't power on but can still be charged without a boost if it doesn't go into protective mode. The protective mode keeps the battery from over voltage and under voltage. These batteries will discharge at faster rates if exposed to the wrong conditions. The battery may possibly be faulty and needs replaced.

Can you plug it into a PC and have the PC recognize the M8? Will it charge or light up the LED when connected to a PC's usb port? If not you should examine the M8 charge port for damage. The charge port may be damaged or dirty and preventing the phone from charging or being recognized by PC."

hey my name is jordan, I was having charging problems with my HTC One M8. it for the lif of it couldnt keep a charge i thought it was my charger cable at first so i tried multiple chargers with the HTC wall adapter and still nothing. eventually my battery just kept draning even with it plugged in untill my phone started dying and i was having a difficult time trying to power it on. so i did some researching and found that if i held the {POWER BUTTON} And the {VOLUME DOWN BUTTON} For 2 Minutes (Yes i know that sounds ridiculous} and to my surprise it started charging again. supposedly doing so recalibrated my battery settings and wahlahhh FIXEDD! very happy hope this helps

"''This could possible work or may not work but give it a try...

If your phone isn't TURNING on and your HTC is off try holding the power button and the volume up and down button for 1 min and then plug it up to an CHARGER WARNING - .DO NOT USE YOUR .COMPUTER TO CHARGE YOUR HTC OR SMARTPHONE IT MAY CAUSE DAMAGE TO THE BATTERY.''"

"READ THIS SOLUTION

if your phone is not charging and showing blinking orange light.

while your phone is off, hold down

power+volume up+ volume down

and while holding three buttons plug in your wallcharger and wait for 10seconds your phone will reboot let all buttons go and let it charge before playing with it.

will work 100% if done rite."

I Solved this problem, by opening it and disconnecting and reconnecting the battery

Ok. I tried everything with the phone plugged in and this is a new wall outlet charger (maybe 3 months old), no damage to the port or anything (i take care of my phones thanks to my ocd). Alright, with the phone plugged in, trying all of the combinations resulted in nothing. But while researching, I did see a post that said to have the phone unplugged, press the power button and volume up button at the same time, then plug it in....and voila! Now this is on an htc one m8 where the volume up/down button is only one and only gives you one option to push up or down, and the power button is at the top, not the side. This is the first time i let it get down to less than 5% before charging....think i accidentally left the camera on and set it down then fell asleep.