Imac shows no picture

I use my iMac as a monitor with a minidp - to - minido calble connected to my PC, and it worked fine.
But today when I turn on my PC and iMac, it shows no picture(just black), and I cannot switch between my PC and MAC OS by pressing command + F2(I used to be able to do that). I can only power off my PC or disconnect the cable to let iMac show image.
Any idea why this is happening?
many thanks

Is the little green light on?
Open Console in Utilities & see if there are any clues or repeating messages when trying one of those Apps.

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#Lync 2013 ForceShowMyPicture - Compiled by Octavio A. Serpa (Octavio-Admin on TechNet)
# Import Lync Module
Import-Module “C:\Program Files\Common Files\Microsoft Lync Server 2013\Modules\Lync\Lync.psd1"
###Variables To Set
#This variable is a folder where files will be temporarily written
$folderPath = “C:\Lync2013Scripts\Export”
#This is the FQDN of the pool in which the users you want to target reside
$poolFQDN = “<lyncpool.domain.local>”
###Done
#Message Out
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If (-not (Test-Path "$folderPath" -pathType container))
"ERROR: Your Export Directory doesn't exist!"
Exit
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If (Test-Path "$folderPath\Lync2013UserData.zip") { Remove-Item "$folderPath\Lync2013UserData.zip" }
If (Test-Path "$folderPath\Lync2010UserData.xml") { Remove-Item "$folderPath\Lync2010UserData.xml" }
If (Test-Path "$folderPath\Lync2010EditedUserData.xml") { Remove-Item "$folderPath\Lync2010EditedUserData.xml" }
If (Test-Path "$folderPath\Lync2013EditedUserData.zip") { Remove-Item "$folderPath\Lync2013EditedUserData.zip" }
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Write-Host -ForegroundColor YELLOW “EXPORTING LYNC 2013 POOL USER DATA”
Export-CsUserData -PoolFqdn $poolFQDN -FileName $folderPath\Lync2013UserData.zip
Write-Host -ForegroundColor Green “EXPORT COMPLETED SUCCESSFULLY"
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Write-Host -ForegroundColor YELLOW “CONVERTING LYNC 2013 USER DATA TO 2010 FORMAT”
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#Message Out
Write-Host -ForegroundColor YELLOW “CHECKING THAT FORMAT CONVERSION WAS SUCCESSFUL AND .XML EXISTS”
If (-not (Test-Path "$folderPath\Lync2010UserData.xml" -pathType leaf))
"ERROR: Verify that $folderPath is writable!"
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Write-Host -ForegroundColor Green “CONVERSION COMPLETED SUCCESSFULLY"
#Message Out
Write-Host -ForegroundColor YELLOW “LOADING XML”
$d = [xml] (Get-Content "$folderPath\Lync2010UserData.xml")
Write-Host -ForegroundColor Green “XML LOADING COMPLETED SUCCESSFULLY"
#Message Out
Write-Host -ForegroundColor YELLOW “CORRECTING AD PHOTO SETTING”
$changes = 0
$lastProcessedUser = $null
foreach ($hr in $d.HomedResources.HomedResource)
$found = 0
foreach ($c in $hr.Containers.Container)
  foreach ($p in $c.Publication)
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     $lastProcessedUser = $hr.UserAtHost
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    $p.PrevPubTime = $p.LastPubTime
    $p.LastPubTime = (Get-Date -Format s).ToString()
    $found = 1
    $changes++
If ($found -eq 0) { [Void]$d.HomedResources.RemoveChild($hr) }
Write-Host -ForegroundColor Green “AD PHOTO SETTING CORRECTIONS COMPLETED SUCCESSFULLY"
#Message Out
Write-Host -ForegroundColor YELLOW “Changes: $changes"
If ($changes -ne 0)
#Message Out
Write-Host -ForegroundColor YELLOW “RE-SAVING XML”
$d.Save("$folderPath\Lync2010EditedUserData.xml")
#Message Out
Write-Host -ForegroundColor YELLOW “CONVERTING LYNC 2010 .XML BACK TO 2013 .ZIP FORMAT"
Convert-CsUserData -InputFile "$folderPath\Lync2010EditedUserData.xml" -OutputFile "$folderPath\Lync2013EditedUserData.zip" -TargetVersion Current
#Message Out
Write-Host -ForegroundColor Green “CONVERSION BACK TO 2013 .ZIP FORMAT SUCCESSFUL"
#Message Out
Write-Host -ForegroundColor YELLOW “IMPORTING LYNC 2013 POOL DATA FOR CORRECTED USERS”
Update-CsUserData -FileName $folderPath\Lync2013EditedUserData.zip -Confirm:$false -Verbose
Write-Host -ForegroundColor Green “IMPORT COMPLETED SUCCESSFULLY"
Write-Host -ForegroundColor YELLOW “STARTING POST-IMPORT-CLEANUP OF EXPORT/IMPORT FILES"
If (Test-Path "$folderPath\Lync2013UserData.zip") { Remove-Item "$folderPath\Lync2013UserData.zip" }
If (Test-Path "$folderPath\Lync2010UserData.xml") { Remove-Item "$folderPath\Lync2010UserData.xml" }
If (Test-Path "$folderPath\Lync2010EditedUserData.xml") { Remove-Item "$folderPath\Lync2010EditedUserData.xml" }
If (Test-Path "$folderPath\Lync2013EditedUserData.zip") { Remove-Item "$folderPath\Lync2013EditedUserData.zip" }
Write-Host -ForegroundColor Green “POST-IMPORT-CLEANUP COMPLETED"
#Message Out
Write-Host -ForegroundColor Green “AD PHOTO SETTING SUCCESSFULLY UPDATED"

When I try to run this I get the follow error. Any thoughts?
Update-CsUserData : Unable to cast COM object of type 'System.__ComObject' to interface type
'Microsoft.Rtc.Interop.User.ICsUserManagement'. This operation failed because the QueryInterface call on
the COM component for the interface with IID '{D5ADD966-BDC3-4A8F-BFE8-6A59A9F74CB2}' failed due to the
following error: Class not registered (Exception from HRESULT: 0x80040154 (REGDB_E_CLASSNOTREG)).
At C:\Lync2013Scripts\ForceDisplayPhoto.ps1:113 char:1
+ Update-CsUserData -FileName $folderPath\Lync2013EditedUserData.zip -Confirm:$fal ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: ([email protected]:String) [Update-CsUserData], Invalid
   CastException
    + FullyQualifiedErrorId : Microsoft.Rtc.Management.AD.Cmdlets.ImportOcsUserDataCmdlet

I want to create an intelligent file to show all pictures with 3 stars or more. Trying this, I don't know the character of the stars to fill in the respective box ??

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Take a look here: http://hints.macworld.com/article.php?story=20110314131100623
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Imac shows no picture

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