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I am running Mac OS X 10.5.8, and I deleted my Minecraft folder in user/Library/Application Support and now Minecraft will not run. I still have my saves folder, but when I tried to make a new Minecraft folder and put the saves folder back into it, Minecraft still would not run. What should I do to fix this problem?

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Have you tried using "Force update"? –  Alvin Wong Mar 14 '13 at 12:18
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"Force update" should actually work. It basically formats and re-downloads your minecraft stuff. (from the launcher, before logging in) –  user1337 Mar 14 '13 at 12:19
    
I can't open the launcher. I click on the Minecraft icon on my desktop and nothing happens. –  user43911 Mar 15 '13 at 18:23

3 Answers 3

You can open your Minecraft launcher and click "Options", then click "Force Update". Then log in to Minecraft and it will work.

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Did you save the launcher to the desktop or is it a shortcut? If it's a shortcut, find where the launcher lives. Delete it and redownload it from minecraft.net. Start it and force update.

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It looks like there is something wrong with the launcher. The launcher will launch even if there is no minecraft folder. I would:

  • Delete your old minecraft launcher.
  • Download a new launcher from http://minecraft.net/download.
  • Make sure to backup your saves!
  • Delete your minecraft (or .minecraft on Windows and Linux) folder.
  • Open up your newly downloaded launcher.
  • Click Options.
  • Click Force Update.
  • Now log into Minecraft normally.
  • Close Minecraft.
  • Copy your saves folder into your minecraft (or .minecraft on Windows and Linux) folder.

If you have any problems, make sure you have the latest version of Java installed. I know 10.5.8 cannot get Java 7, but Minecraft will run on Java 6.

Another possibility is that you have a PowerPC (PPC) processor. Computers with a PPC processor cannot run Java 6, and are stuck on Java 5. Minecraft is discontinuing support for Java 5. The changes are planned for Minecraft 1.6, however.

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