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The problem might be the battery. Please charge it full. If the battery is fully charged and still it won`t boot up, try this methods.
1. Remove battery, wait for a few seconds,
2. Reinsert battery.
3. Press and hold the VOLUME DOWNbutton,
4. Then press and hold the POWERbutton
5. Then release the POWER and VOLUME DOWN buttons
6. Press VOLUME DOWN to selectFACTORY RESET, and then press thePOWER button
You can also use master reset. Hold down power button together with volume up or down button until you will see a screen in blue color with the logo>navigate and select wipe data/factory reset using your volume keys. Wait until your phone is completely rebooted.
Detached the SIM card to avoid contact deletion., likewise the SD card for file.
Turn it completely off. The reason its hot andvfreezing up is two words, Youtube!!
It ttrying to watch, download or even send. Its too Much for it to be able to do. Next time turn your device off. That will stop the Rams from jamming everything ,freezing everything. But just reboot by pressing and holding the powerbutton until the device turns off and comes back on. When it turns back on release the power button.
This is actually a bug in the BlackJack II's firmware. If you power the BlackJack II off, but you're unable to power back on, try removing the battery for about 10 seconds, then reinsert the battery and power back on. The power button should work now.
(At the moment there's no permanent fix for this.)
Does that adequately resolve the issue?
Are you turning the BlackJack II off to conserve battery? While flying? Something else?
This has happened to my Blackjack II and I've found if I plug it into the charger then plug the charger into the wall, the phone comes right on. It's a pain, however, if I'm not at home when it decides to do this since no amount of button pushing will turn it back on, it acts like the battery is dead (when I know it isn't!)
BTW, I've have to have my SIM card switched out twice and the battery replaced 4 times since I bought this phone brand new in February......
If you haven't already tried it, you may want to try a hard reset. (Warning: the hard reset process will erase all content and settings that you've added to or created on the phone.)
Hard Reset for BlackJack II:
1) Power off the BlackJack II
2) Hold the UP button on the directional pad
3) While holding the UP button, press and hold the Power button
4) When prompted, press the 1 (or 'E') key to continue
5) When prompted, press the 'Y' key to confirm
If this doesn't resolve the audio issue it's probably microphone related and you'll probably want to research replacement options.
i think all you have to do when the phone is locked is push the top left (...) button right under where it says "unlock" on the screen. Then push the */sym button next to the zero. I have never needed a code to unlock. also, when your phone is locked, you have to lightly push the power button on the top of the phone to get the screen back on.