![]() ![]() ![]() I also tried resetting PRAM, to no effect. It's the same behaviour detailed here but note that I have verified that my disk has the correct GUID partition table. My problem is that when I then click on the installer, I get a loading bar for some seconds and then the screen goes to a circle with a slash through it. When I restart the computer holding Option, the installer shows up as a bootable disk ( unlike the question here). Drive creation seems to work fine: it has the correct GUID partition table, terminal command exits with the copy complete done output, the disk shows up in the Finder as "Install OSX Yosemite", etc. Now select your boot volume (the Partition tab will not be available. Go to the First Aid tab and click the button to Repair Disk. Select your hard drive device (when you do this, a Partition tab will appear). Open Disk Utility in the OS X Tools window. I've been following instructions here to do a clean install and here to create a bootable flash drive. Restart your Mac and hold Command-R down immediately, to boot into Recovery Mode. I've decided to try clean-booting Yosemite to see if this improves things. I tried upgrading to Yosemite hoping this might improve performance no dice. I have a Late-2011 Macbook Pro (4GB RAM) that has been running slow for several OSX cycles, and since Mavericks it's been unbearable (spinning beachballs whenever you do anything). ![]()
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