My fitbit seems "dead". Tried to charge it but no reaction...

The Status Bar that is displaying itself related to your FitBit is the Battery Life/Charge Level Indicator for your FitBit, it changes Colors as the battery reaches different stages, it'll be different colors with low or critically battery life remaining for example. Your Fitbit manual will give you a more accurate answer as to what each color means but usually Green is associated with a Full Charge and Still Shows Green Doen to About 30%-40% Battery Life Remaining, Then It’ll change to Yellow or Orange until it gets critically low which is about 10%-15% and 10% or less will most likely be RED to let you know it’s time RON Charge orb go without the FitBit because it’s almost dead. Most Bluetooth Devixes Show their Battery Status or Charge Level on your phone, hopefully this helps and feel free to let me know if this helped by clicking the icon to let me know this was helpful. You're welcome RON leave a review or follow me as well. All the same, I hope this helps you out.

Of course you can do it with a screen protector.
The Guide Of Reset Fitbit Charge HR Complete Guide

Try a wall charger, have you changed anytime in the computers bios?

I'm having trouble setting up my tracker using ... - Fitbit Help

help.fitbit.com/.../en.../I-m-having-troubles-setting-up-my-tracker
FitbitJul 31, 2015 - I'm having trouble setting up my tracker using my computer ... If you followed the steps in How do I set up my Fitbit tracker on a computer? and couldn't complete ... Your tracker is charged. ... Or, if you'd prefer to get in touch:.

most likely it has a bad dynamo (alternator, or generator the thing that charges the battery?)

You can put the software right, with a reset. Hardware errors and batteries won't change a bit when you use the reset button. When the battery is bad, and it looks that way, just return the Fitbit and ask for a new or new battery. It still should be under warranty. If the warranty is only 90 days for the battery, never again buy a Fitbit in the place you are living. In Europe electronics have a warranty of 24 months.

This happened to my Fitbit, but it occurred because of putting it through the washing machine and the dryer. When I first took it off the shirt it was on, I couldn't get a response of any kind from the device no matter how long I held the button or put it on the docking base. I followed the Fitbit site instructions to put it in a cup of rice overnight. The next morning, I pressed the button and got nothing. Then I put it on the docking base and it flashed "Fitbit 4.14." Everywhere I looked online said this meant the device was damaged and would need replacement. My husband suggested I try to reset it while it was on the base, so I held the button down until, to our surprise, the battery symbol came up, which meant it was low on charge and was no charging. I let it charge for awhile, took it off the base, pressed the button, and amazingly I got my normal display and it rotated through all the options just as it should. There's no guarantee that this will work on every device, but try all of that before you give up. It just might work.

Could be the power connector on the bottom is worn out. I have sent mine back to Palm to have this repaired, it seems to be a common problem at the moment this question has nbeen posted a lot recently

Kevan