Hi, Last week I got my RAM upgraded from 512MB to 2GB on my Mac mini Intel Core Solo 1.5GHz 2006 model, and I wanted to reinstall Mac OS X Tiger (using the original discs that came with my machine). Just wondering if the RAM has changed (i.e. since mine is now 2GB) the original discs won't work? Cause right now I try slotting in DVD 1 of the installation discs and it just stays on the Apple splash screen with the continually spinning icon underneath the Apple logo - won't go any further. At first I thought it might be either the DVD drive or something else but a friend suggested it may be the RAM that's not making the discs work as according to him the discs will only work with the original hardware and specs (i.e. 512MB RAM) of the machine (unless its a retailer version). Can anyone confirm this please? Thanks, Ben. Edit: Found out it was partition related that's causing the disc not to boot past the Apple splash screen. I accidentally deleted the hidden OEM partition when messing with partitions (and this is what makes the grey discs ability to boot into the installer). I went to an Apple authorised service provider near my area and they tested a retail copy of the Mac Box Set of Snow Leopard and it booted into it fine - purchased Snow Leopard Mac Box Set yesterday, installed perfectly . If you have Tiger or don't have leopard currently installed, you need to purchase the Mac Box Set of Snow Leopard at approximately £129/$169.