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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
Press F12 on startup to get the boot options, select yr DVD/CD drive and this will reset your password.
Alternatively find a local PC repair guy. If they're any good they can do it in 5 minutes for a nominal charge. If they try to charge lots of money walk away. It's an easy fix if you know what you're doing.
There usually a button cell battery on the motherboard. Remove this and wait for system to discharge there usually somewhere you can short out to remove residual charge but without details I recommend just giving 5-10 mins. Replace battery BIOS should be reset.
you will have to contact Toshiba. desktop units are fairly easy to reset bios passwords. laptops are very difficult if not impossible to do this with. if you are the original owner of the laptop they will assist you with walking through the reset process. if this is out of warranty they will charge you. good luck !
Better you first charge the battery for 16 to 17 hours and recheck the same. If problem persists, change the battery from where you bought it. that battery is faulty. And yes there is no need to install the battery from device manager. Just open the battery compartment and replace the battery with new one.