you have just about covered everything that might be suggested here.
The next step would be to boot from an external OS X source to see if the problem is software or hardware related.
Disk Warrior or Tech Tool Pro both come with a version of OS X built in. Not free but not exceptionally expensive either. In order of preference, (mine of course) DW then TTP
Unless you can lay your hands on one of those, then the Mac Tech is your next stop.
FYI, that "Linux" command line is actually a UNIX command line.
Hey there. My Macbook Pro running Lion (2011 I think) just started flipping out, freezing at the grey Apple screen and going no farther into the boot process, no matter how long I wait.
I've tried booting in "Verbose Mode," and it stops short with this message every time:
" efiboot loaded from device: Acpi (PNP0A03,0) /Pci (1FI2) / SATA (0,0) /HD (Part 2, Sig00005765-1E06-0000-FE55-0000C7010000)
boot file path: \System\Library\CoreServices\boot.efi
..Loading kernal cache file 'System\Library\Cached\com.apple.kext.caches\Startup\kernelcache' ...
root device uuid is 'AEA287EA-B11D-3CD0-97A5-D925B8612DBD' "
I tried booting into the "Recovery Drive" and nothing different happens. Grey Apple screen forever.
I tried booting in "Safe Mode" and.... nothing. Grey Apple screen.
I tried booting in "Single User Mode" and enter commands in the LINUX command line. It doesn't allow me to type anything.
I also did the reset thing where you hear the "startup sound" 3 times. This did reset the system settings for sound and mouse tracking speed, but did not help the situation.
I DO have everything backed up in cloud storage online. I DO NOT have an OS recovery disk. Bought the laptop used without one.
You guys are my last hope before taking this baby to a Mac Tech and laying out serious cash. Thank you to anyone who has sage advice!
ps. Didn't know how to attach a screen shot, so I transcribed the screen message. If you know how, please enlighten me!