Config Mgr OS deployments when using PXE boot , you’ve probably had machines that did not want to boot the task sequence as it stated “No task sequence found, booting onto the hard drive”. This is most likely due to a previous task sequence being advertised
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Read the complete post at http://scug.be/blogs/sccm/archive/2010/11/16/configmgr-2007-pxe-cache-behavior.aspx