Frozen at boot - Loading initial ramdisk

Have you tried this?

At grub enter E to edit the boot command, remove quiet and splash and add nomodeset i915.modeset=0 nouveau.modeset=0 to the same line.
Then try again ALT-F5 to get a tty console after waiting a minute.

Disabling modesetting

You may want to disable KMS for various reasons, such as getting a blank screen or a “no signal” error from the display, when using the Catalyst driver, etc. To disable KMS add nomodeset as a kernel parameter. See Kernel parameters for more info.

Along with nomodeset kernel parameter, for Intel graphics card you need to add i915.modeset=0 and for Nvidia graphics card you need to add nouveau.modeset=0. For Nvidia Optimus dual-graphics system, you need to add all the three kernel parameters (i.e. "nomodeset i915.modeset=0 nouveau.modeset=0").

Note: Some Xorg drivers will not work with KMS disabled. See the wiki page on your specific driver for details.

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