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I have a 24inch early 2009 imac with triple boot(mac, windows 7, linux), ubuntu was the last one i installed, everything is running fine on all 3 systems except when i restart with ubuntu, it doesn't shutdown and then restart, instead it freezes on purple screen after "restarting system" message.

I've tried many many solutions, such as changing grub settings like GRUB_CMDLINE_LINUX="reboot=efi/bios etc",GRUB_CMDLINE_LINUX_DEFAULT to something else, installing my current graphics card driver etc..

Again, everything else works fine, shutdown works fine, only restart freezes on a purple screen and i have to do a hard shutdown, any solution is appreciated, thanks in advance.

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