Currently Being ModeratedNov 21, 2012 8:36 AM (in response to OnePotato)
The MacBook 3,1 (Late 2007 model) is compatible with Lion as long as it has sufficient RAM and disk space.
Your best bet may be to get an external hard drive and clone the internal system to it. Use a backup program such as Carbon Copy Cloner. It's easy and reliable, and you end up having a useful external hard drive when you are done.
Best of luck.
Currently Being ModeratedNov 21, 2012 10:31 AM (in response to OnePotato)
Currently Being ModeratedNov 21, 2012 6:32 PM (in response to dalstott)
I ended up installing the new drive and the Geniuses at the Apple Store reinstalled Snow Leopard for me saving the challenge of cloning and making a bootable disk.
They confirmed what Laundry Bleach indicated about Lion being compatible with my MacBook but Mountain Lion is not — go figure.
Many thanks to both of you !
Currently Being ModeratedNov 21, 2012 7:24 PM (in response to OnePotato)
It's mainly the video card. The Models 2,1 through 4,1 have video cards with non-upgradeable 32bit drivers. The model 5,1 Late 2008 and newer have at least the NVIDIA GeForce 9400M with 64bit drivers. Mountain Lion requires 64bit native drivers. Mountain Lion no longer supports Intel's GMA 950 or GMA X3100 graphics processors.
While Lion used some 32 bit and a lot of 64 bit code, Mountain Lion is pure 64 bit, which excludes more systems than Lion did. It's not something you can add memory to, for example, as it involves the base architecture.