Hi Guys
Good day
Unfortunately my Z ultra smartphone do not power on and do not responde to charge in normal way, even after long time. (charging Red or Green LED did not turn on and did not vibrate anymore)
Accidentally i found that when i press Power Button (keep down) before plugging to charge My smartphone Powers On!!! and works without any problem, so charges to 100% 
anything looks good, my smartphone is alive but when i unplug charge that get powered off again and did not power on anymore 
i bought new Battery but problem did not fixed, can you guys help me?
i removed battery, plug it to charge and try to power on smartphone vibrates 1 time and nothing happen, this is good or bad news?
android: 5.1.1
kernel version: 3.4.0
build number: 14.6.A.1.236
thank you
Ali