On 2/10/10, Paul Moortgat <paul.moortgat at pandora.be> wrote: > > The last 2 address gives a 404. > > On 10 Feb 2010, at 22:02, John Baltutis wrote: >> On 2/10/10, Paul Moortgat <paul.moortgat at pandora.be> wrote: >> => >>> A friend now told me that it is impossible to install a lower OS >>> version on a Mac Pro without reseting the SMU. >>> Does anyone know about? >> >> I don't know anything about the SMU (possibly you meant the PMU >> (<http://support.apple.com/kb/HT1431>) or the SMC >> (<http://support.apple.com/kb/HT3964>)}, but as far as installing >> lower OS versions, see <http://support.apple.com/kb/HT2186> and >> <http://support.apple.com/kb/HT1159>. Then, you need to fix your installtion, since all four work properly from all links in all the posts I've received.