How to reset nook when it only stays on 3 seconds?i just got done charging

Nook HD will not charge, or turn on. ' Nook Support Forums

https://bookclubs.barnesandnoble.com/thread/9608

Barnes & NobleApr 6, 2013 - I have a pretty new nook HD, it was a Christmas gift. ... The device stillwon't turn on. ... Sometimes it takes up to 1/2 an hour to turn on if the battery charge... Yes, the indicator light has always briefly flashed green then orange on my device. ...But you said plug it into wall charger first and leave it overnight. Nook HD charged for days, green light, still won't turn on! - Nook ...
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indicator light changes from yellow to green
It died while on the charger

Barnes & Noble Nook HD
Will not take a charge

You can first try doing what's called doing a Soft Reset. It's the first and preferred method to try as you don't lose any files or settings. Hold the power button until the Nook turns itself off. In most cases that will be twenty seconds or more. Then turn the power back on by holding the power button down for about two seconds. Hopefully this will allow you to complete a normal boot process. The second and more dramatic way to get a working Nook back is what's called doing a Hard Reset. This process will put your Nook back to "Just Out of the Box" mode. You will lose any files and settings stored internally inside the Nook itself. The good part in all this is it won't touch anything stored externally on your external SD Cards. To do a Hard Reset Turn the NOOK off completely. Hold the Power button and Home (n) buttons. The device will turn on. Continue to hold both buttons until the device shuts off once again (~15-20 seconds). Turn the device on normally. It will prompt for a factory reset. Press the Home button twice to confirm. ------- The important part in the above is to be sure you start the Nook via holding down both the power button and the Home (n) buttons at the very same time and keep them both pressed down until the Nook turns itself off.

Nook tablet won't charge

This is how to do a HARD RESET - Means Factory fresh.

Turn the NOOK off completely.
Hold the Power button and Home (n) buttons. The device will turn on. Continue to hold both buttons until the device shuts off once again (~15-20 seconds).
Turn the device on normally. It will prompt for a factory reset. Press the Home button twice to confirm.

If the screen is off and won't turn on, make sure the battery has a charge. Plug in your device for 30 minutes before trying anything else. If it is on or if the battery has a charge you may need to "hard reset" the Nook. Although this is very uncommon, it may happen. Below are a few solutions that may help.

• Hold down the power button for 10-15 seconds. The Nook should power off and you can turn it back on again. Everything should work normally.
• If that does not work you will need to hold down the power button and the "N" button for 10 or more seconds. Again, this should force your device to power off and you can start it up normally.
• Take out the N2A Card and try the same steps again. Your Nook should boot up into Nook mode. You'll have to restart it again with the N2A Card in to boot up in Android mode.

One of the tasks above will usually correct this issue unless you have a hardware problem with the Nook. Our cards cannot cause hardware problems unless they are forcefully inserted wrong. If you determine you do have a hardware problem you will need to take the Nook back to the retailer if it is still under warranty. The Nook usually comes with a one-year (non-accidental) warranty through Barnes & Noble. Some retailers, like Best Buy, exchange them in the store under warranty.
Don't forget to hold onto your N2A Card until they return your Nook!
If you still have any kind of issue thenhttp://www.tablethelpline.com/nook-support/ you can take Nook Help from experts by calling nook customer service number.

Without further explanation, pictures or details of what you tried, it's hard to tell what exactly is wrong with your Nook. However, assuming that the battery is still good you will need to "reboot" your Nook.

Unlike other tablets, there is no reset button, but you can try this.

While pressing the Nook button (upside down u on the front of the tablet), press the power button on the side. You will need to hold it for couple of seconds.

In order to start using your Nook, you'll need to register it through the Barnes & Noble website - I've shared the steps below. Once you've registered it, you will be able to start purchasing and reading books. Please note that you will need to set-up a B&N.com account first. That is done on BN.com and simply click "new user account." Once you have set that up, follow the below Nook set-up steps.
NOOK Set-Up Steps

1. Charge your new NOOK 3G or NOOK Wi-Fi for 3-hours from a wall outlet using the Power Adapter and USB Cable packed at the bottom of your NOOK box.
2. Turn on your NOOK by pressing the power button at the top.
3. Connect to Wi-Fi.
4. Register your device by entering your BN.com account email.
5. Tap the down arrow button in the lower right corner of your color touchscreen.
6. Enter your BN.com password.
7. Tap Submit