Not responding plugged my device to pc for charging then plugged it off when it was showing the warning icon do not disconnect without properly ejecting.so it could not be switch on and couldn't respond anymore.then it responded another day, unfortunately my young bother plugged it off again like i did.So what do i do.pliz help

Time to change the battery

You say it's a new battery. Is the battery the same EXACT spec? Some aftermarket batteries don't work well with your laptop. The pin-out/connections may be incompatible. That said, in your BIOS is there a "Battery Learning" section.

I can help..
So with the device plugged into your PC, iTunes open, if it shows up in iTunes eject it, or cancel the prompt to restore a device in recovery mode.

Hold down the Power button for 3 seconds

Without releasing the power button, also hold the Home button for 10 seconds

Without releasing the home button, release the power button and keep holding the Home button for 20 seconds.

iTunes will detect an iPod in recovery mode, let off button and set down device and hit RESTORE in iTunes.

Hope this helps!

QUESTION ONE:
Can you see it in "My Computer"? It will show under "Removable Drive/Storage"

QUESTION TWO:
Double click the removable drive to open the folders. Can you see your music, photo and movie folders?

QUESTION THREE:
Can you see the player in Coby Manager - under the "DEVICE" tab?

QUESTION FOUR:
When disconnected from the computer, how long can you listen to the Coby player before it goes off?

If not present in My Computer or in Coby Manager/Device Tab, then it is not plugged in correctly.
a. Disconnect the player from the computer.
b. Wait for it to cycle through "Please Wait" and "Updating Library" screens.
c. Make sure the player is TURNED OFF
d. With player TURNED OFF, reconnect wire to the player then to the computer.
e. You will see a USB connector icon on the player screen and the player charging.

It will appear to be charging all the while it is connected to the computer.
After it has been plugged into the computer for an hour, it should be well charged unless the battery is completely run down. In that case, you need to do an initial 8 hour charge - with the coby player OFF - through the computer. (This one got me when I first got my player!)

f. Use the Coby Manager to disconnect the player (Found HERE CobyMedia Manager fix for MP822 (Windows XP/2000/Vista)

1. Open Coby Manager
2. Go to the DEVICE TAB
3. CLICK on EJECT Button in lower right hand corner.
4. It will have a pop-up screen to ask "Do you want to eject?" Click YES.
5. The second pop-up screen will tell you "The device can now be safely removed from the system."
6. Disconnect the player from the computer.
7. The Coby will now show "Please Wait..."
8. It will take the Coby about 10 minutes on the "Please Wait" screen and then on the "UPDATE the Library" screen - Be PATIENT

You should now have enough battery power to use it. To check the battery level,

1. Turn on the player
2. The battery icon is in the upper right hand corner of the screen - it is ALWAYS RED until it starts to go down... I've not had mine down very far, but believe the red line gets shorter as the battery is wearing down.

Hope this helps.

Charging device: Plug the device into computer. You can unplug the device any time you want without problem with device
If your device's battery has empty, you need 3 hrs to charge to full.
If you want to check battery level during devive plug into pc: (set up MTP or Auto mode) open My Computer, right click on icon of the device, select Properties, it shows you batteries level

First, go into Control Panel, select System then Device Manager.
Scroll down to see Universal Serial Bus Controllers. It should look something like this...
Look to see a small icon showing the device is not working properly.
Follow this link to Microsoft's site which will walk you through the process of restoring uSB capabilities...
http://support.microsoft.com/kb/817900

New batteries are shipped partially charged. Before you start using your device, it is recommended that you charge the battery. Some batteries perform best after several full charge/discharge cycles. You can charge the battery in two ways: • Charging the device’s battery by connecting the power adapter. • Connecting your device to a PC via the provided Mini USB cable. Note: Only the AC adapter and USB cable provided with your device should be used to charge the device. Charging is indicated by a solid amber light on the left LED indicator. As the battery is being charged while the device’s power is on, a charging icon will be shown on the title bar of the Today screen. After the battery has been fully charged, the left LED becomes green and a full battery icon appears on the Today screen’s title bar. Warning! Do not remove the battery from the device while you are charging it using the AC or car adapter. As a safety precaution, the battery stops charging when it overheats. When the low-battery warning appears, do the following: • Immediately save your current data. • Synchronize with your PC or connect the power adapter to charge the battery. • Turn off your device.
Hope this helps, let me know if I can help you with anything else.
JimmyC

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This player shows the "Do not disconnect" message when it is doing something critical such as transferring tracks or updating firmware, which could corrupt the player if disconnected part way through.

The player shows the "OK to disconnect" when it is idle. As the message says, it's ok to disconnect, as the player will not corrupt if disconnected when it is idle.

These messages mean that the player does not need the "Safe to remove" procedure.

It is ok to disconnect part way through charging. Also the player will condition the battery once it is fully charged, so it's ok to leave it charging.

Occassionally batteries can "memorise" when constantly disconnect and reconnected without fully charging and discharging. To help prevent this, fully discharge the player (leave on until dead) and fully charge and condition (leave charging for about 12 hours) every couple of weeks or so.

Yes, the iPod will show that it is charging on its screen. Disconnecting without ejecting can cause data loss of whatever is stored on the iPod
Ejecting is when you remove the iPod from the desktop by dragging its icon to the trash or clicking on the down arrow next to the iPods name from within iTunes.

If you use the library computer, usually a Windows based OS, you'll need to click on the iPod icon from the task tray on the lower right of the screen. You can right click to select the remove option