what if my macbook is built in 2006?
The original poster said they had a Mac mini, if the Mac mini is an old PowerPC based model then it cannot run Mac OS X 10.6. Both 'late' and 'early' 2006 models of the Mac mini had Intel processors and hence should be able to run Mac OS X 10.6.
All MacBooks have used Intel processors and hence all can run Mac OS X 10.6. No PowerBooks or iBooks can run Mac OS X 10.6.