I built a PC that's been working for a while (aside: mainly using a non-Windows OS, which seemed to start kernel panicing more frequently). It stopped booting in any OS from the partitions on the SSD (giving BSOD 'STOP: 0x0000007B (0x80786A58, 0xC0000034, 0x00000000, 0x00000000)').

I installed Windows 7 on a separate drive and magicandre1981 kindly explained how to make the old SSD partition work by switching to AHCI mode in BIOS (and make the new HD partition work by enabling AHCI).

However since this whenever I select shutdown in either Win 7 partition, the machine restarts instead (it shuts down in 1 out of 10 attempts). This happens even when I explicitly log out and then shut down from the logon screen, and even with all cables bar power & monitor unplugged. This SU question suggests updating to BIOS, but I'm not sure other OSes I want to reinstall/reenable will work after this. I'm no BIOS expert, but have changed a few relevant-seeming settings, and mine look much like the bottom half of these ones.

  • 3
    have you changed the SATA mode in the BIOS from AHCI to IDE or IDE to AHCI? – magicandre1981 Feb 20 '13 at 19:27
  • I just did. In IDE mode the old Win 7 SSD partition gives the 0x7b error, while the new Win 7 HD partition works; in AHCI mode it's vice versa. What does that mean? – tog22 Feb 21 '13 at 22:35

ok, change the SATA mode back to the IDE so that you can boot into Windows with your HDD, and read the KB article to enable AHCI:

Error message occurs after you change the SATA mode of the boot drive http://support.microsoft.com/kb/922976

Now you can change the mode to AHCI again and boot into the HDD and SSD.

  • Thanks! I can now boot into both Win 7 partitions (HD and SSD). However shutting down either partition almost always restarts instead, as in this unresolved SU question - don't know if you can help with that? – tog22 Feb 22 '13 at 22:16
  • Sorry is this is bad form, but I'm editing my question to explain this, and that it happens with the switch to AHCI, and so unaccepting your answer. – tog22 Feb 22 '13 at 22:32
  • sorry, I have no idea why you have the other issue. I've never seen this. – magicandre1981 Feb 23 '13 at 6:14

My first suggestion would be to update your BIOS, following the manual for your specific motherboard. I had a similar issue with booting my new build that was due to a BIOS issue with my particular SATA drive. I would also update the drivers for all of your devices.

I have several other suggestions for you, but this site has just about all of the ones I could think of and provides guides to help you through many of them as well (including updating drivers), so I would suggest going through these and seeing what you can come up with.


  • Answer appreciated,though the other one worked! I'm wary of updating my BIOS as I want to reinstall OS X and am not sure this'll support a new BIOS version. – tog22 Feb 22 '13 at 22:21

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