PXE Boot issues in Configuration Manager and WDS
Already had problems with PXE on multiple clients. In some cases problems are recurring and just install a fix or upgrade to R2.
The product team blogged an important summary of the most common problems with possible solutions;
PXE-e53: No boot filename received
PXE-T 01: File not found
PXE TFTP-3B: Error-File not Found
PXE DHCP-and 55 Proxy Service did not reply to request on port 4011
Follow the link to the post and if you work with SCCM 2007 and save: http://blogs.technet.com/b/configurationmgr/rss.aspx