MBP 15 bad display after wake up issue

Hi all
I hope you can help me. I've googled so much about vertical lines in display but no one seems to have my problem. If the computer sleeps (or power off) during some minutes, after wake up I get a screen fully filled with vertical lines of the same color, about one pixel width. I've reseted PRAM, SMC. Normally after another sleep-wake up the screen gets fine. Any suggestions?
Thank you very much

Try resetting your SMC and PRAM.
Resetting the System Management Controller >>
Dave M.
MacOSG Founder/Ambassador  An Apple User Group  iTunes: MacOSG Podcast
Macsimum News Associate Editor  Creator of 'Mac611 - Mobile Mac Support'

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    ==========           
    ======         
    =======                                                               
    ======== 
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    29.08.12 00:15:09 MESZ   SlowResponse   
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    29.08.12 00:15:09 MESZ   Sleep          
    Maintenance Sleep Sleep: Using BATT (Charge:38%)                      
    29.08.12 00:15:10 MESZ   SlowResponse   
    PMConnection: Response from AirPort configd plug-in is slow (powercaps:0x0)
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    29.08.12 00:15:10 MESZ   WakeRequests   
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    29.08.12 00:15:14 MESZ   Assertions     
    PID 1333(backupd-helper) Created BackgroundTask "backupd-helper" 00:00:06  id:0xc00000295 Aggregate:0x40
    29.08.12 00:15:29 MESZ   Assertions     
    PID 1333(backupd-helper) Released BackgroundTask "backupd-helper" 00:00:20  id:0xc00000295 Aggregate:0x40
    29.08.12 07:01:24 MESZ   Assertions     
    Summary- Aggregate:0x40 Using AC                                      
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