Imagine you have an older Mac (like my Mac Book Pro 15” from 2005), you have Lion installed (last OS that it takes) and then you want to give this one to someone else.
Now the first thing that you for sure want to do is to erase the entire content of your hard disk and then re-install Lion from scratch to be sure that the new owner does not have access to your data.
If you have a Lion Installer Thumb Drive you can now reboot your Mac while holding the Option key. Then you select the ER Built (USB Icon) drive.
After the Installer comes up you can go to the Tools menu section, select the Disk Utility and format your boot drive. After this is done restart, hold the Option key and select again the Installer Thumb Drive.
If you were unlucky like I was then you will see a dialog that says:
There was a problem installing Mac OS X. Try reinstalling
What the ….?
First I thought the thumb drive is bad, then I doubled checked that both the Thumb Drive and the Mac’s boot drive are OK. Finally, just before giving up, I googled the problem and found an Apple Discussion that discussed the problem and had a solution.
It turns out that I had to reset the PRAM in order to be able to Install Lion again. As much as I love the ease of use of OS X sometimes it comes with a huge price tag. I would never have thought of this and I was spending a considerable amount of time to try to resolve it before I searched the Internet. It would have been nice if the Mac could give a hint of what is the problem and not just displays this somewhat useless Dialog.
Especially considering that this is rare but still possible scenario for a regular Mac user.
At least I got passed that issue and could installed Lion again.
Cheers – Andy