Boot problem question - lion boot recovery dvd disk

It sounds like either you or the Autocad uninstaller removed a OS X system file required to run the system.

You can make your own Lion install/boot DVD. If Lion came with your computer you will need to use this admittedly arduous process. If you bought Lion from the app store it is much easier. Just start the App Store app and hold down the option button while you click the purchases button. Then redownload Lion and make yourself a install DVD or USB key by following this.

Reinstalling Lion over top of your system will only reinstall Lion and will not delete or remove your data as long as you just do an install and do not erase the drive with Disk Utility.

It will install whatever version is on your DVD. So for example if your DVD has 10.7.2 on it, you will need to run software update to update to 10.7.4. It will just be one system update though. You would not need to DL 10.7.2, then 10.7.3, then 10.7.4... it will DL straight to 10.7.4 or whatever the latest version is.

When you grab the installer from the App Store though it is always the latest version, so if you make an installer today it would be 10.7.4. It is helpful to have a boot DVD or USB key around to avoid the long download time of a Lion reinstall if you are maybe away from home and not on a fast connection.

 

USB Recovery for Lion???

I have close to the same problem. I power up Apple logo, pinwheel and loading bar at bottom. 30 secs late cuts off. Tried Disk Utl. and says boot file corrupted back up and reinstall OS. If you make a USB recovery do U need the internet to contact apple store?

 

You certainly can.

Not if you choose to erase all the contents of your drive and install Lion from scratch. You can restore your Mac from a Time Machine backup, though.

 

If you have made yourself a full Lion installer USB key, you can install without Internet access. However, it you jus made the recovery USB key, then yes you will need Internet access to DL the actual Lion install.