A glitch in the tablet, issues with the charging cable or a malfunctioning micro-USB power port may cause a Kindle Fire to fail to charge. A Kindle Fire tablet may also fail to charge if the user has connected it to a deficient power outlet.
As of 2015, a user can troubleshoot glitches with a Kindle Fire tablet by resetting it, pressing the power button for approximately 20 seconds. If the tablet does not turn on again, the user should charge it and turn it back on after 15 minutes. Micro-USB cables that are not designed specifically for the Kindle Fire can also cause problems with charging the tablet due to connection and compatibility issues.