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Does it have a micro USB charger/charging port? This was the universal charging adapter most manufacturers other than Apple moved to around 5 years ago. In my experience, the charging port to charger connection can become loose and prevent charging....especially if you use the tablet or phone during charging. The best method I have found to troubleshoot the issue is to try a charger that successfully charges another device and plug it into the tablet or phone. If your device still does not charge, and especially if the connection is loose, it is most likely that your charging port is damaged. Another possible issue would be the battery itself but the charger or charging port is the most likely culprit for your issue.
If the port on the tablet is loose/damaged or the cable/charger is failing, then the tablet may not be charging even though its plugged in.
If you can, try a different cable.
Make sure the charger is the correct one for the tablet! Some tablets require more electrical current then a computer's USB port provides. Same thing applies if you are using a 'phone' charger with the tablet, might not be enough current.
Most USB ports/chargers output about 5 volts DC (direct current), but they can vary in the amount of Amps (A) or mili-Amps (mA) they produce.
FYI - the symbol used to represent Direct Current is straight horizontal line with a dashed horizontal line directly under it.
Most computer USB ports only produce 500mA.
Most phone chargers only produce 1A.
Many tablets require 2.1A or 2.4A to properly charge.
Check with your tablet manufacturer to find out what your specific make/model requires and the look closely at the charger you are using to see what the OUTPUT is ... e.g. 5.2V 2.4A
It sounds like there's a problem with the charger. The wire on the charger is rather delicate. So is the port on your tablet where the wire plugs in. There may be a break inside the wire. If you dropped your tablet while the wire was plugged in and it hit the floor on the charger plug, the charger plug could have damaged the charging port in the tablet or the wire itself could be damaged.
Find someone else who has the same tablet and ask to switch chargers to see if either of them still work on the other tablet. If your friend's charger starts charging your tablet without a problem, then the problem is a a broken wire in your charger. If neither charger will charge your tablet but both chargers charge your friends tablet without a problem, then the problem is with the charging port on your tablet.
Possible charger damage.
If you know someone with a charger you could use, you should first plug their charger into your unit to see if it works, if not, plug your charger into their unit.
If your unit will not charge with new charger, you may have serious damage, if the other will not charge with your charger, your charger is broken.
If it won't charge then you may have a defective charger, a failed battery or a loose solder joint at the charging port. If your charger plug is fitted with a fuse then consider checking the fuse is okay by trying a new one. Also, check your charger on a friends HTC, check their charger on your HTC. It really is a process of elimination to find the issue yourself. The HTC won't turn on because it isn't charged, until you fix charging prob it won't turn on.