I was charging it then after i come back it won't switch on

Lillian, May have to try hard reset or possibly repair charge port to get battery to start charging. Check the attached links,instruction and guides, Good luck
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."
My Kindle won charge
Kindle Wont Start or Charge How to Reset Kindle
Troubleshooting Kindle Fire That Won Charge
Kindle Fire Won Charge Fix

Help My tablet won turn on what do do

Why Does My Android Phone or Tablet Not Turn On

Patricia, Using the power switch, you can forcibly reset your Kindle device. This reset will shut down the Kindle without accessing the shutdown command from within the Kindle's operating system, a particularly useful tool when dealing with a frozen Kindle. To initiate a hard shutdown, Kindle disconnect from its charger, slide and hold the power switch for about 20 seconds. This will force the Kindle to shut down, now it can be restarted normally.
Check links below for charging problems.
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."
Reset Kindle Fire When it Won Turn on or Charge

Troubleshooting Kindle Fire That Won Charge

Kindle Fire not charging

9 common problems with the Kindle Fire HD and how to fix them

either the charger or the charger cable is bad. battery ran all the way down, and now you cannot turn it on. needs to be charged with a working charger/cable

Check these guides, hope it helps

Reset Kindle Fire When it Won Turn on or Charge

This tablet does t reset with the power button unlike other Android devices. When you hold down the on/off switch, it only drains the battery. If you see the color indicator still charging, allow a full charge.Then, only stay put and pulse the button for a moment quick and let it rest few seconds to try again and again. Only when u see a light coming out of the screen, and I recommend you do this with the power cord on, you hold the power switch down until the rebooting is iniciated. Let go til it is finish and see where the problem is. More likely, like mine, the Settings stop working and needs tune up for the CPU. Never leave an application running when closing your system. With or without internet connection.

I had the same problem before, it may need to charge but, your charger might be fried from having it plugged in too long... purchase or find a new charger for your product

hardware issue i think

Mine does that to but all I ever do it just hit the reset button on the back and it turns back on.