"No entry" sign on bootscreen, Late 2011 15" MBP

[miguelfp1]

Hi everyone, let me apologize in advance if the post ends up being long winded.

My issues started after updating to 10.8.3 on my MBP (Late 2011), the installation appeared to complete before returning an "Installation Failed" message, the version numbers correctly appeared as 10.8.3, but the system had no audio.

I tried restoring to the Time Machine backup I performed immediately before updating, only to be greeted by the "no entry" sign on my boot screen. Using a backup from some days prior to the incident have the same result.

Finally, I clean installed OS X 10.8.3, and tried restoring the backup using Migration Assistant after booting on the clean system, but that resulted in the same outcome after restarting the machine after a "successful" 3 hour restore (I've been at this trying to get it working since 1pm yesterday afternoon).

I've tried resetting PRAM and SMC, to no avail, and also tried holding Shift at startup to hopefully boot in Safe Mode, but again, it doesn't proceed after getting the circle with slash symbol on my boot screen.

I'd reaaally appreciate any tips or insight into this, as I really can't start over from scratch with the computer right now, as I need the data on it for my classes (Engineering student).

Thanks

 

[miguelfp1]

This is the output after booting in Verbose mode (Command-V), upmto the point where it stops.

 

[Ccrew]

What's the Seagate device? You have an external drive hooked up?

Almost looks like it's trying to boot to the external device and can't. Like maybe that was somehow set to the startup drive.

Try holding down option on boot to be sure the internal HDD is the boot device. That doesn't work also try disconnecting the external devices and hold down the X on boot to force it to look for a boot drive.

 

[angusmcfisher]

Do you have a non-Apple SSD installed? I had this same issue... https://forums.macrumors.com/threads/1557777/

 

[miguelfp1]

Hi, thanks for replying. I managed to delete the offending kext via Teinal, it's a Seagate FreeAgent 500GB drive that I use for my Time Machine backups. No idea why the issue flared up after restoring, but I breathed a huge sigh of relief when my computer finally booted up.