Hi, Help my Macbook wont start-up. When I switch it on it comes up with a flashing folder with a question mark in. I have been advised to start from my Mac OS X installation disk. However, the website says "Insert your Mac OS X installation disc (if you have discs with both versions, use whichever is closest to the Mac OS X version installed on your Mac; do not use a startup disc which came with a different Mac or which contains an earlier version of Mac OS X)." My original installation disks are Mac OS X 10.4. But I have been upgrading my system. My last upgrade was to Mac OS X 10.6. Which disk do I use? Do I use the 10.6, as this is the one with the current operating system or do I use 10.4 as this was the original disk that was bought with the macbook. Any advice will be much appreciated.