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Reasons for your problem :
1) The battery was dry out or dead. 2) The circuit or contact point of the on/off switch was broken. 3) Main circuit board or the monitor was dead so you just see a flash when you turn your phone on (I had the same experience...). 4) The worst part... your phone was dead. 5) The best part... you did not press the on/off switch.
The simplest reason causing a phone not turn on is a dead or drained battery. It happens when the phone gets immersed in water, dropped or allowed to fully drain the battery. The symptom is phone not turning on and not charging the battery. When that happens, make sure first that the battery is not just dead or drained before you send the phone to the service center for repair or before you buy a new battery. You may decide to send it right away only to find out the battery is simply dead/drained or buy a new battery only to find out the phone is dead.
The first thing you can do is borrow a friend’s known good battery similar to yours and try it in your phone. If the phone turns on, you are pretty sure your battery is dead or drained; otherwise, it's time to send it for repair.
When it is verified that the battery is dead or drained or if you don’t have someone to borrow from, try to revive the battery before you buy a new one. You just need a9-volt battery, a 6-12 volt power supply, or a DC adaptor (6 or 9 volts) and a set of wires.
Connect the set of wires to the terminals of the 9-volt battery, power supply, or DC adaptor whichever is available.
Look for the polarity markings on your battery and connect the other ends of the wires to the battery terminals in the same polarity as the source above. The positive terminal is marked (+) while the negative is marked (-). Do this for 10 to 60 seconds or until the battery gets slightly warm. Do not use this procedure to fully charge the battery.
Insert the revived battery in your phone and charge it until it is fully charged. If the battery works well and does not discharge easily, you don't have to replace it.
In the event that it is not verified whether the phone still turns on or not using a known good battery and the battery is revived but the phone is still not charging the battery, the phone is dead; send it to the service center for repair.
If it won't turn on. Meaning it doesn't turn on turn on. The phone is dead and gone. If the phone turns on but sticks at the apple logo, that means it needs a restore/update. If the phone turns on and stick at the usb/apple logos. That means it needs to be restored.
To restore or update. You need to use itunes. If the phone is bricked and dead, dead... Then you need to get a new phone
Your phone could be suffering from:
A dead battery. Replace it.
A dead Charger not charging the battery, try a different charger to confirm. If dead replace.
A faulty power on switch. You need to confirm and replace it.
A dead phone (I hope not). If nothing works then the phone may be dead. Sometimes the connections snap with the slightest of jerks and the phone goes dead. You need to carry out the fault finding and rectify the fault.
If it still does not come on then replace the phone. But in this order.