Thank you for your post and welcome to the forum.
As the error message suggests, please connect your phone to Nokia Suite and click on the green arrow icon where you can either update or reinstall the current software. The option to reinstall the current software is displayed in blue, you can use this option when no update is listed.
If the above doesn't work, please visit a local Nokia Care Point where the phone can get checked and repaired if necessary.
My N9 does not power on. Sometimes I get a message that I should press the volume up button, but it is for a few seconds. Please help me.
Sounds as if you have tried to install Android ICS upon this N9 to get this prompt amd something has gone wrong, as this should only appear the first time when it takes 3- 5 minutes to boot; you may have to re-flash device software.
Symbian specialist until 31/01/2013 with interests in Maemo & MeeGo but an aversion to Windows!
Your post seems to have lost something in English translation, but you may need to re-flash software upon your N9 to restore to "as new" condition:http://talk.maemo.org/showthread.php?t=82693
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