Connected the phone to a wall charger but the charging light did not come on. I tried another charger (my sone has one as well) but that still did not indicate a charge. I left the phone all night in case it was charging but not sjowing the light. In the morning the battery was lower so clearlyit had not charged. I tried the two different in-car chargers but no luck. I tried the USB charge cable on my PC but the PC did not recognise the phone was there at all (Activesync couldn't find it). I have tried many soft resets and eventually resorted to a hard reset, but by this time the battery was almost dead and now the phone does a soft reset every time you turn it on, get part way through a reset and switches off. I can use my son's phone to re-charge the battery but the hard reset dowsn't seem to have worked so I've run out of ideas!

Fix an Android device that won't charge or turn on Use the steps on this page to fix the following problems on your phone:

• Won't turn on
• Has a black or blank screen
• Turns on but immediately turns off

Hold the power button First, try holding down your phone's power button for 5-7 seconds. This usually restarts a phone.
Troubleshoot your cable, charger, outlet & case

1. Use the charger and cable that came with your phone. To check that the charger and cable are working, try them with another device.
2. Check that the cable is securely connected to the charger and to your phone. Check that there's nothing in your phone's port, like dust or lint.
3. Plug the charger into a wall outlet. To check that the outlet is working, plug in something else, like a lamp.
4. Check that no accessories, like cases or battery packs, cover your phone's sensors or press its buttons.
   
   

Troubleshoot your battery charge

1. Plug in your phone with a working cable, charger, and outlet, then wait one minute.
   
   • If you see a battery icon, your phone is powered off and is charging. You can restart right away.
   • If you see a red light, your battery is fully discharged. If the red light is flashing, there isn't enough power to turn on. Charge your phone for at least 30 minutes before restarting.
   • If you don't see a battery icon or red light after you plug in your phone, the issue could be with your screen.
   Tip: Battery icons and lights can vary by phone. For your phone's details, contact your device manufacturer

Fix an Android device that won't charge or turn on If your Android phone or tablet isn't starting, won't turn on, has a black or blank screen or turns on but immediately turns off, try these steps to fix the issue.
First, try holding down your device's power button for five to seven seconds. This usually restarts a device.
Step 1: Troubleshoot your cable, charger, wall socket & case

1. Use the charger and cable that came with your device. To check that the charger and cable are working, try them with another device.
2. Check that the cable is securely connected to the charger and to your device. Check that there's nothing in your device's port, such as dust or lint.
3. Plug the charger into a wall socket. To check that the outlet is working, plug in something else, like a lamp.
4. Check that no accessories, such as cases or battery packs, cover your device's sensors or press its buttons.

Step 2: Troubleshoot your battery charge Within one minute after you've plugged in your Android device with a working cable, charger and wall socket:

• If you see a battery icon, your phone is powered off and is charging. You can restart right away.
• If you see a red light, your battery is fully discharged. If the red light is flashing, there isn't enough power to turn on. Charge your phone for at least 30 minutes before restarting.

To restart your phone, press and hold the power button for a few seconds. Then, on your screen, tap Restart . (If you don't see 'Restart', press and hold the power button for about 30 seconds, until your phone restarts.)

Step 3: Troubleshoot your screen If you don't see a battery icon or red light after you plug in your Android device, the issue could be with your screen.

1. Press the power button for about 30 seconds.
2. Wait about 2 minutes.
3. Make your phone ring. You can call it from another phone or use Find My Device.

Please try the below steps:
1.Try another charger
2.Remove your battery and try to charge/turn on phone while connected to verified working charger
3.try another wall outlet

Let me know what happens so that I may further assist you.

try this

SAMSUNG GALAXY S5 - NO POWER, BATTERY, CHARGING AND CHARGER ISSUES

No power, battery, charging and charger issues

This guide contains troubleshooting steps and advice to help resolve issues you may experience when attempting to charge the handset.
After performing each step, please test to see if the issue is resolved.
Symptoms:

• Battery not charging
• Battery is not lasting long
• Phone won't charge
• Charging error
• Failure to charge
• Display remains black or blank
• No power
• Boot failure
• Overheating

Troubleshooting Questions

• Are you using the correct equipment?Make sure you are using an approved Samsung wall charger and USB charging cable. Other brands of charging accessories may have different voltage parameters and could cause charging issues when used with Samsung devices.
• Have you charged your phone for longer than 30min? Leave your phone plugged in to the charger for about 30min without powering on. In some cases, it may take slightly longer for your phone to charge.
  
• Is the battery icon displayed on the screen when charging? After charging your phone for a little while you should get a battery charging icon appear on the screen which will indicate that your battery is charging properly.
  If the charging icon appears, leave your phone for a little longer before you try to switch your phone on.
  If however, the screen is blank and nothing is displayed, follow the below troubleshooting steps.
  
• Is the charging cable plugged into a USB port? Some charging cables can disconnect from the wall outlet adapter and plug directly into a USB port. However, when plugged into a USB port, the charging process is much slower due to the limited power output of USB ports. Instead, plug the device directly into a wall outlet to speed up the charging process.
  
• Is the outlet faulty? Try a different outlet or check for a switch connected to the outlet. If possible, try powering a different device on the same outlet.
  
• Does another USB cable, or wall charger work? Charging issues can occur if either the battery or charging cable is damaged. Verify that the charging contacts are clean. If necessary, clean the contacts using a cotton swab and rubbing on isopropyl alcohol.
  If possible, test the charging cable by plugging it into another device and seeing if the device charges. Alternatively, try charging the device with a different cable. This may mean changing out the cable or the adapter on two-piece chargers.
  If charging through a car charging kit, ensure that the car engine is running, and if possible try to charge other devices using other cables, through the same car kit. If none will charge, then it is likely there is a fault with the car charging kit. It is recommended to continue to cross-test devices, cables, and car kits until the problem device can be identified.
  If the device charges when using a different USB cable or wall charger, the issue most likely lies with the charging accessory. In this case, follow the approved charger repair / replacement process.
  Also, if the charger is connected via an extension or other multi-socket adapter, remove this and plug the charger directly into the wall-mounted socket. This will eliminate the possibility of a fault with the adapter.
  If you are still unable to charge your device, continue to the next step.
  
• Has the phone experienced any shock or exposure to water? Accidental physical shock to a handset can sometimes cause problems to arise with battery or charger, as these components contain delicate parts, particularly. Damage can occur either to the component itself, or to the component's connection to the motherboard.
  Water exposure can also lead to damage of these components, however due to the slow way in which this type of damage can manifest itself, the cause may not always be readily obvious.
  With any physical damage of this nature, the only recourse is to contact the device manufacturer, and follow their approved repair or replacement process.
  

^_^

I have the same problem and finally found out the internal battery was bad. Having a terrible time trying to locate one

hi there, have you checked your wall charger if is working? why don't you try other charger to test your phone if is charging, try this first before we go to other option. thanks

first of all charge your phone .....just put the charger in the charging jack.....and let it get charged and when the charging get complete long press call end button and the phone will on

There is probably something wrong with the wall socket charger. Try a different charger on your phone and a different phone on your charger and see which ones work.

ok, try this...
Go to (Options -> Memory : then make sure that "Mass Storage Mode Support" and "Media Card Support" is set to "On", and "Auto Enable Mass Storage Mode When Connected" is set to "Prompt".)

Connect to your computer.
Let me know if that works for you. If not we can try a couple other things.

Okay, I searched and searched until I found a solution that worked for me. I tried the USB thing, I got my phone to turn on once, but never to charge. Here's what I did:

(Do this at your own risk)
I zapped my battery with a 9v battery. One wire on each terminal and then held it to the MDA battery (positive to positive, negative to negative) for about three seconds. I did this about five times. (Don't let the wires touch while they are connected to the 9v battery.) I IMMEDIATELY plugged my phone into a wall charger, NOT my computer (The computer wouldn't charge my phone). As soon as it was connected to the wall charger, I turned it on. After starting up, the orange light came on, and it started charging. I was skeptical about this solution at first, but trying everything else I resolved to do this and then if it didn't work buy a new battery, but it worked and my MDA is charging as I'm typing. The original ideal came from a post on the xda-developers website by dew1989. I added the additional steps that got my battery charging again. I hope this helps!