I was trying OS deployment on a server multiple times, it refused find assigned task sequences. I double checked target server’s SMBIOS id and MAC address in assigned server. It keep failing with this error:
There are no task sequences available for this computer.
If you look in the SMSTS.log you may also see the following error:
No assigned task sequence.
Setting wizard error: There are no task sequences available for this computer.
It turned out to be there is a duplicate SMBIOS id exists in SCCM database. Of course I am trying to rebuilding a existing server…..God Dammit!!! Don’t they tell in plain English there is a duplicate BIOS id exists in the error messages. Another Microsoft error wasted my time.
I have deleted the previous server name from SCCM computer collection and retried with great success.
Reference information: OSD Task Sequence fails with "There are no task sequences available for this computer" if multiple machines have the same SMBIOS GUID
Anand, the Architect 
Thank you for explaining what to do here. I manged to Delete the computer name in SCCM and this corrected the issue with trying to install Windows 7.
Thanks so much
Matthew Lovelace