Thanks for that.
I managed to install 10.8.5 using the instructions for MLPostfactor. Everything seems to work OK. However when I did step 14. open up Terminal and type "sudo kextcache -system-prelinked-kernel -a i386" to rebuild 32bit mode cache; this will remove the need to boot with "-f" flag.
I got the following error, however as I mentioned above everything seems to work and I do not need to boot with the -f flag.
amers-macbook:~ Amer$ sudo kextcache -system-prelinked-kernel -a i386 Password: kxld[com.apple.driver.AppleACPIEC]: The following symbols are unresolved for this kext: kxld[com.apple.driver.AppleACPIEC]: _AcpiHwRead kxld[com.apple.driver.AppleACPIEC]: _AcpiHwWrite Link failed (error code 5). Prelink failed for com.apple.driver.AppleACPIEC; aborting prelink. Failed to generate prelinked kernel.