I have reached the point of needing to rebuild by MBP, but without inheriting the existing problems. My MBP is around 3 years old, running Snow Leopard, but with 8GB RAM, over 30GB disk space and not running lots of apps. It runs too slow, including QuickTime being unable to run full screen HD videos - or even 1/3 or 1/2 screen without buffering and effectively losing picture. Web browsing is ok, but anything remotely hard work on the machine grinds it to a halt. It also randomly crashes and then just appears at the login screen, having crashed out of everything, so something is clearly wrong. I have tried reinstalling the OS once from the disk (standard reinstall over the top), and restoring pretty much everything from Time Machine (iPhoto, iTunes, etc.). However, nothing particularly changed or improved. Can anyone suggest how to get back to a clean Mac, and re-import from Time Machine without bringing back the issues? For example, you can't seem to select specific apps, just the whole lot - and then I get rubbish like old AV I am unable to remove. I don't know if iPhoto is a bit clunky and could do with a "clean up", but I have over 7,000 pictures in folders and albums and I don't fancy doing that all over again. Any thoughts much appreciated.