I have on the screen following message: disconnect battery or power supply device in modality safeguard; if i disconnect battery or power supply after that i get the same message and it does not work.

Try removing the battery and leaving it for 24 hours to allow any internal issues to reset themselves.

Step 1 Look at the camcorder's display to identify if it is in Safeguard Mode. If its display indicates an error number of E01 to E06, your camcorder is in Safeguard Mode.
Step 2 Disconnect your camcorder from its power source and remove its battery by sliding the latch forward and sliding the battery down while pulling it away from the camera's body. Wait at least two minutes before continuing.
Step 3 Remove the camera's cassette by pressing the "Eject" button, waiting for the cassette door to open, and lifting it out of the tape bay. This step is only necessary if the camera indicates the E03 or E04 error code or it tells you to eject and reinsert the tape.
Step 4 Replace the camera's battery, power connection and cassette, and turn the camera on.

Make sure your new battery is charged. Start with the device turned OFF & disconnected from ALL power sources.
- Note: to make sure the device is NOT in standby mode (instead of OFF), press & HOLD the power button (for UP TO 60 seconds) to see if there is a prompt to turn it off.

Press & HOLD the lower-right corner of the touch screen (not the frame)
Continue to HOLD the screen, while switching the power ON.
- You SHOULD see a message on the screen about "clearing user data" after several seconds.
Once you see that message, you can RELEASE pressure on the screen and touch the YES icon.

The device should now Reset. Following any prompts that may appear, and then take the unit to a CLEAR area so that it can find the satellite signals. This can take up to 15 minutes after a reset.

Follow this manual step by step on for first time use. Read from page 7 and upwards. It is located here.

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What error message appears,it should say E0..

Unit stuck in safeguard mode

In the case the encoder position is not shifted
to the next point though the loading motor has
rotated in the loading direction for 4 seconds
or more. This error is defined as [E01].
1. The mechanism is locked during mode shift.
2. The mechanism is locked at the mechanism loading
end, because the encoder position is skipped during
mechanism mode shift.
3. No power is supplied to the loading MDA.

Put it on fire and buy some good camcoder<br />

You mix te info with Write protected tapes.
Safe guard mode is caused by the motor that takes the tape out of it's case, through the mechanics and past the video head.
If for some reason the electronics detect that it's been done by too much force, the safe guard issue promts.