I have done a fresh install of Fedora 22 on the same computer 4 times. Each time, after using the system from 1 day to 3 days and having successfully rebooted several times, a reboot results in being started in emergency mode. This computer was running Fedora 21 since its release without any problems. I am using an ASUS P9X79 Deluxe motherboard.

At the emergency mode console the following is displayed in yellow:

Ignoring BGRT: invalid status 0 (expected 1)
ata16.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6
ata16.00: irq_stat 0x40000001
ata16.00: cmd a0/01:00:00:00:01/00:00:00:00:00/a0 tag 1 dma 16640 in
Inquiry 12 01 00 00 ff 00res 00/00:00:00:00:00/00:00:00:00:00/00 Emask 0x3 (HSM violation)

Running journalctl -xb has the following lines in red:

Jun 30 14:48:15 mac.localdomain kernel: Ignoring BGRT: invalid status 0 (expected 1) Jun 30 14:48:15 mac.localdomain kernel: ata16.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6
Jun 30 14:48:15 mac.localdomain kernel: ata16.00: irq_stat 0x40000001
Jun 30 14:48:15 mac.localdomain kernel: ata16.00: cmd a0/01:00:00:00:01/00:00:00:00:00/a0 tag 1 dma 16640 in Inquiry 12 01 00 00 ff 00res 00/00:00:00:00:00/00:00:00:00:00/00 Emask 0x3 (HSM violation) Jun 30 14:48:32 mac.localdomain kernel: EDAC sbridge: ECC is disabled. Aborting Jun 30 14:48:32 mac.localdomain kernel: EDAC sbridge: Couldn't find mci handler

I have tried installing to a new hard disk. I have tried a different video card. I have run fsck on the hard disk after booting a live image. No errors were found. Nothing I have tried has changed the result.

Where do I start in order to determine the cause of this problem?
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