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Try to reset the device. Reset the Reader by pressing the RESET hole with a small pin or clip. After 5 seconds, slide the POWER switch to restart the Reader. The content and settings stored on the Reader are not affected by resetting.
You can try manual format & reset. It will delete EVERYTHING on the device, but will not harm your SIM or contacts. Remove any memory cards before doing this. Shut the phone off, and hold down both the top part of the circle pad(the spinning one) and the power button at the same time
or: flash new software install in the phone problem will solved quickly
Try to power off the phone, and get out the battery. Leave it 5 minutes and them try to open it (with the battery put on again). See if problems are appearing again. If yes, contact a service store because you cannot solve it.
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?
Hi try pulling out the battery for a few min and later when you put back the battery , keep your phone for charging. Then try switching off and off when the charging is taking place. Hopefully it should solve the problem.
Just to make the suggestion a bit clearer,
1. switch phone off, probably take out the battery if the power button doesn't work.
2. hold down call (green), 3 and * all at the same time. best with right hand.
3. turn phone on. with left hand.
4. wait a bit and phone will come up with formatting. does take a bit, so be patient.