Console Shows No Client Installed, GUID Conflict

Are you having problems with machines that have SCCM Client installed but show no Client in the Configmgr Console.Can’t find anything wrong in the logs. Tried to repair the installation, but still no luck.
Have checked the boundary, and verified that it connects to the Site and finds an MP.

Well after some digging the great Jason Sandys mentioned  to compare the UUID / GUID from the client with the properties of the resource showing in the console.Mine had different GUIDs but the same IP and hostname.

To fix this GUID conflict I performed the following steps on the client:

• Execute ccmdelcert.exe (wait for process to terminate)
• Delete the file %WINDIR%SMSCFG.ini
• Execute ccmsetup.exe /uninstall (Check ccmsetup.log for success)
• Delete directory %WINDIR%system32ccm or %WINDIR%SysWOW64
• Delete directory %WINDIR%ccmsetup
• Execute ccmsetup.exe (Check ccmsetup.log for success)

  You will need to download the SMS 2003 Toolkit to use ccmdelcert.exe

• http://technet.microsoft.com/en-ca/systemcenter//bb676787.aspx