Edit: After half day, my wife’s Mac started having the same problem. I have then applied the solution that I found in the Apple
Migrate Safely to OS X Lion – Make Old User Accounts Work In the New OS
OS X Lion developer preview is released and it functions on its own. Upgrading your system with a developer preview isn’t exactly the best idea, so you can carry a clean install. The problem here is about getting the old user accounts to work in the new operating system. But worry not – here is how you can do it:
To use the OS X Beta developer preview, the biggest problem might be migration of user info. The worst thing that you can do is to install Lion Beta over the existing operating system like Snow Leopard. The best way to get a new operating system is to use a firewall drive, a USB or a separate partition in hard disk.
Open the Disk Utility and choose your chief hard drive from the bar on the left side, and then go to Partition tab. Click on the + button from the lower left corner and fine tune the size of the partition. When you do that, the file format should be OS X Extended.
As you install Lion, the system will prompt you to make a user account. When you make it, the username, short name and password should be the same as the current account running in Snow Leopard. And while you will be signed in, go to the System Preferences and click on Users and Groups. Now go to the present account and then right click on the username. From the menu, select Advanced Options.
Now restart your system, and log in. Your user account would be accessible through OS X Lion. Any changes you make will be shown in the new account.
Here is a handy tip:
To switch between Leopard, Snow Leopard and Lion, you just have to press the Option key at the time of booting. Here you will find a hard drive list along with their partitions that have the operating system. Now you can select the operating system you want.
Are you eagerly waiting for OS X Lion? Are you going to wait till June for the official release? Or will you get the developer preview? Let us know through comments.
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