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May 2, 2012 6:32 AM in response to alexfromtollesburyby Limnos,First double check your computer can run Lion. Get more information about your computer. Go to the Apple in the upper left corner of any window, then "About This Mac", then "More Info..." Copy and paste the information here, but omit the serial number and Hardware UUID (if present). Compare with the following:
Mac OS X: System requirements for Lion - http://www.apple.com/macosx/specs.html Note this says 2GB RAM but you probably need at least twice that.
System discs will only work if they are retail version discs. Discs that came with a particular computer will not work in another model.
To install Lion you don't need Leopard but you do need to install Snow Leopard, then download Lion.
Installing Lion: Our complete guide - http://www.macworld.com/article/161064/2011/07/installing_lion_complete_guide.ht ml
How to install Lion over Leopard - http://www.macworld.com/article/161087/2011/07/install_lion_over_leopard.html -- probably the same for Tiger.
OS X Lion: Installation Guide, Boot Discs and Q&A - http://www.macstories.net/mac/os-x-lion-installation-guide-boot-discs-and-qa/
Snow Leopard broke some applications from Tiger era, Lion breaks many more;
If you have any PPC applications they will flat out not run under Lion. Many have complained about this because suddenly Lion became a major expense with upgrading software.
In general I would say that if you have a computer that came with Tiger, going to Lion may be too much a step unless you absolutely have to run Lion. If I had your computer I would upgrade to Snow Leopard and stick with that for a few years.