Htc amaze 4g wont turn on after charged

Put it in airplane mode and charge, turn off to charge, close all windows and apps. Try new charger, clean port and plug with alcohol. If none of those work check warranty

it means that something is wrong with your battery or its charger

Oops, it does not have to be, at times, I meant, supposed battery failure

If the battery contacts/pins for your phone/tab are not making contact well with the battery terminals/heads...you will experience such, constantly.

If the battery does not sit/fit well in its compartment, you will still experience same as you do at present. This is because, the battery is making partial contact with the terminals/pins.

Check these; whether your battery sits well and fits perfectly in its compartment inside your phone/tab.

Check whether the terminals are contacting well

Aside of these, you may need to either replace your cellphone/tablet's battery and watch what happens.

Check for a bad battery, charger in that order.

Each can be gotten inexpensively on ebay. eBayeBay

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.

Try leaving it on the charger for a few hours and see if that helps.

The best thing to do right now is to exchange it to see if it is the phone itself.

replace the battery for starters
check that the charger is putting out the correct voltage

Dont try to unlock your phone with free unlockcodes which you get from some sites.entering wrong inlockcodes will brick your phone or it will be hardlocked. so its a better idea to buy unlockcodes from any trusted online vendors.

From my personal experience i would recommend http://unlockgenie.com/.
i unlocked my HTC AMAZE 4G with their help. i placed the order and i got my unlockcode along with the unlocking instructions to my mail address. the code worked fine and now i am using my HTC with my favourite network provider