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Hi, I followed the great guide in setting up SCCM 2012 as I am a new to SCCM but I have run into some problems With PXE booting; thanks for the guide add thanks in advance for any help. My main issue is that we can’t PXE boot from Unknown Computers and we get TFTP TIMEOUT. My first problem which I think is fixed was this: After setting up SCCM I noticed that my Unknown computer group was empty but I eventually repopulated it with the following registry change: To recreate the collections, change the registry value of CreatedUnknownDDR under SOFTWARE\Microsoft\SMS\COMPONENTS\SMS_DISCOVERY_DATA_MANAGER on your primary site server (not the CAS). Set the value to 0. This plus re-adding the Unknown Computer query gave me 4 unknown computers, I seem to have 2 x64 and 2x84, is that an issue? I have added the network card driver to the boot image and the task sequence to make sure It can PXE boot but it should at least PXE boot even without the driver. After those things and endless Googleing we can’t get it to work. So please any trouble shooting ideas? Which logs? Changes? Anything will be very helpful and appreciated thank you.