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Cannot boot to any OS after installing Fedora 21 on windows 8.1

asked 2015-01-25 14:36:08 -0500

Maruf gravatar image

updated 2015-01-25 14:47:35 -0500

Hello everyone! I am facing a common after-installation problem of Fdora 21 on my ASUS K450L which came with a pre-installed Win 8.1. CPU is Intel Core i7 4500U. I installed Fedora 21 with the CSM mode enabled (which I guess was a mistake, as the win 8.1 was possibly installed in UEFI mode) from bootable usb, with the 'Secure Boot' turned off. Installation went smoothly, but Windows nor Fedora could boot afterwards. I've been getting something like "insert a proper boot device and reboot". I could only boot Fedora from live usb only when the CSM/Legacy set on. I have found a similar problem/answer here - which suggests to reinstall the fedora with CSM turned off. This is not possible in my case since I cannot boot the live usb with the CSM disabled. I am very new in Fedora and really dont know what more information should I provide. Any solution/link will be greatly appreciated. Thanks!

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...and then I reread and see you've only gotten Fedora going with CSM enabled, sorry :P Can you explain what happens when you boot in UEFI mode, and how you created the USB media?

randomuser gravatar imagerandomuser ( 2015-01-25 14:44:29 -0500 )edit

At the beginning, you say that you installed Fedora with CSM disabled, and it worked, but didn't properly set up the system for boot. At the end, you say that you can't boot the Fedora liveusb with CSM disabled at all. Can you clarify please, I think it must be one or the other.

I also think that Windows 8.1 was installed in UEFI mode, and if you disable that functionality by enabling CSM, you should expect it to not work. So, we should focus on getting Fedora working in UEFI more, or you should reinstall windows in CSM mode.

randomuser gravatar imagerandomuser ( 2015-01-25 14:44:44 -0500 )edit

@randomuser I guess I was not clear enough - I installed Fedora with CSM enabled. Now I am trying to re-installing it with CSM disabled, but cannot do it- everytime I try to reboot, it bounces back to UEFI interface.

Maruf gravatar imageMaruf ( 2015-01-25 14:46:41 -0500 )edit

@randomuser I created USB media using Universal USB installer. When I boot with CSM Disabled (Fast boot is enabled in boot config) it takes me to the menu - (start fedora live/troubleshoot/test media). If I press c it takes me to grub> line editing. I dont know what to do here so when I exit it takes me to the BIOS again.. If I select start fedora live then it takes me to dracut:/# command line. I dont know what to do here either :(. On the other-hand, if I boot with CSM enabled, when I exit from the grub, it takes me to the fedora installation.

Maruf gravatar imageMaruf ( 2015-01-25 15:12:19 -0500 )edit

Thanks @randomuser , I will try it now.

Maruf gravatar imageMaruf ( 2015-01-25 15:18:22 -0500 )edit

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answered 2015-01-25 15:15:08 -0500

Okay, that explains it. Tools like universal USB installer and unetbootin do the job of changing ISOs that are only set up for optical booting to boot via CSM. Fedora media is already set up for optical, CSM, and UEFI booting - so by using those tools, you break the image. Use one of the direct write methods at to create the media, and try again with CSM disabled.

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Asked: 2015-01-25 14:36:08 -0500

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Last updated: Jan 25 '15