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My original plan was to put the new SSD in my laptop, boot from the USB, format the drive, install ML, and then restore from time machine. If the circle persists, what are my options? I have both a time machine back-up and a super duper clone on an external hard drive. I am going to try using another USB, and if that fails, try the same thing via Firewire drive hopefully. I noticed the USB light does not seem to be on during boot.

I tried both the manual method and using Lion diskmaker, both with the same effects. I also suffered from the circle with a lion through it. Before putting the new drive into my computer, I wanted to be sure my bootable ML USB worked. I recently obtained a new Samung 840 SSD.

I have successfully used a USB to boot from Lion on many computers before. I just want to install a clean Mountain Lion install on my new rMBP because I originally migrated from my older MBP and there's just too much junk on my new system, which has drastically worsened my start-up and shut down times and just makes the system not 'feel as new', so I want to do a fresh install and only put the stuff I really need on this MBP. My existing Mountain Lion partition on the SSD is FileVault encrypted. Both times I made sure I had a GUID partition. Grey circle with a slash through it, spinning wheel, nothing else happens. Sometimes the thumb drive's read light is on, sometimes it isn't.Īfter reading this thread I re-did the USB thumb drive using Carbon Copy Cloner, but it's the same story. Every time I try to boot using the USB drive I get the grey circle with the slash through it and a spinning wheel and it just sits there doing nothing, even 15, 20 mins later.

I made a bootable USB drive using Lion Disk Maker. I am facing the same problem as Macboy Pro.

Osx boot from usb