iMac 27 pci pause: sdxc

Hi,

Exact same problem today. My post is here: https://discussions.apple.com/thread/6453797 I am very glad I found this thread. I used the trick to boot into single user mode and disable fsck and then reboot (took about 10 minutes) and finally rebooted. BTW: both fsck and DiskUtility report absolutely no problems with my harddrive. Not sure what is going on but nothing in the logs seems to be helping.

Kevin

I have absolutely the same problem with my MacBookPro here: MacBook Pro Retina Mid 2012 (MacBookPro10,1 NVIDIA GPU)

I bought this MBPro used over eBay and after I got it the seller checked it again and told me it was defect with a black screen.
He brought it to repair in germany and a new mainboard was installed - the MBPro run ok with OSX 10.8 as far I noticed.

So I upgraded to 10.9.5 and install my system from a timemachine backup and now I have the same pci pause: sdxc error :-(

Well Helga,

Sorry for my terrible English.

I have the same problem.

I have a Mac Mini i7 10 GByte ram.

I can work with no problem with my Mac. Day after day.

But when I reboot my Mac it stops with booting on the line.

Pci pause: SDXC

I tested everything, hardware test, memory test so the internal drive test.

the question is; is it a hardware problem or een software problem?

I don't now. !!!

Grusse aus Winterswijik die Niederlande.

Henk

Hi,

I used "That Guys" solution from earlier in this thread and once I had it booting, no problems since. Here are the main points from That Guys post.

1. Enter the Single-user boot mode (cmd+s at launch)

2. Type those lines :

root# /sbin/mount -uw /

root# mv /sbin/fsck /sbin/fsck.off
root# cp /usr/bin/true /sbin/fsck

3. Restart your computer, enter verbose mode (hold cmd+v)

4. Wait for it, it took 2 min to boot (instead of 1h of wasteful wait i had experienced), after being stuck at pci pause : sdxc

5. Now, you might consider putting fsck back.

And to put it back you do the following after everything boots properly.

root# cp /sbin/fsck.off /sbin/fsck

Since I have done this, no problems since. It took my computer about 20-25 minutes to finally boot in his step 4 not the 2 minutes he quoted. I did verify that the fsck run on the boot drive said everything was okay (or run DiskUtility). One other thing I changed was to put fresh batteries in my mouse and keyboard just in case low voltage was causing issues with my wireless mouse/keyboard causing flakey interrupts.

Please give "That Guys" solution a try as it worked for me and I have been rock solid since.

Hope this helps,

Kevin

I've tried it!

Maybe I have made a typing error!

Example the spaces between the commands.

Well it didn't help. Again maybe type errors by me.

I will try it again the next time.

Thank you for the post

Regards.

Henk

I also noticed a system problem with a 2012 Mac Mini, the boot into single user mode showed "Pci pause: SDXC"

as this was a new 'feature'/bug! to me I was able to reverse the most recent change that I made to my Mac mini, which was playing in the Energy Settings pane of Control panel (OS X Mavericks 10.9.5 Build 13F34) which I tend to think may be responsible for my problems?

I had recently set to 'Selected' Put hard disks to sleep when possible

'NOT Selected' Wake for network access

'Selected' Enable Power Nap

and I set Computer sleep: to Never

perhaps co-incidentally I then got quite annoying pauses/freezes of normal computer use & the "Pci pause: SDXC"

so I set everything power-saver back to

'NOT Selected' Put hard disks to sleep when possible

'NOT Selected' Wake for network access

'NOT Selected' Enable Power Nap

and I set Computer sleep: to 3hrs

and it is performing as it used to!

more hardware details Macmini6,1 , 2.5GHz Intel Core i5, 10GB 1600MHz DDR3, HDD Seagate Momentus 1TB hybrid (Model: ST1000LM014-1EJ164), Storage 2 x USB3 ext HDD MyBook 2TB (great) & MyBook 3TB (Don't buy this - it's encrypted/compressed drive - no longer readable without the original case)

This is a fix I have used:

1. Boot Mac in target disk mode

2. Connect to another Mac via Thunderbolt

3. Navigate to /System/Library/Caches and delete the "Startup" cache folder on afflicted Mac

4. Eject Mac HD in target disk mode and reboot the afflicted Mac

Many thanks David, I've had about 5 or 6 iMacs with this problem since upgrading my whole fleet to Yosemite. In most instances re-installing sys software worked, but 2 have failed to respond to that. Just tried your solution on one of those and bingo.

I think this will be an on-going issue for me. I haven't noticed any posts from Apple on it, so thanks for the fix.

Hello everyone !

It's such a shame Apple hosts a platform to discuss bugs, but seems to never have a look at it…

Anyways.

Thank you all for your efforts ! Could someone explain step by step the procedure to put fsck back ?

I tried the solution which starts with turning it off, but the solution didn't work. Before I move on to the next one, I wanted to be sure to start clean..

I don't understand command lines, so if we first did a "mv" (mv /sbin/fsck /sbin/fsck.off) is it ok to start directly with a "cp" (cp /sbin/fsck.off /sbin/fsck) ?

I'm gonna try the target mode solution, and let you know if it worked !

Thank you for your help

worked perfect thank you.

boot into single-user mode

#mount the main boot-volume

/sbin/mount -uw /

#remove the dummy fsck-binary

rm /sbin/fsck

#rename the backup-fsck-binary back to fsck

root# mv /sbin/fsck.off /sbin/fsck

That fixed it, thanks! (booted into Single-User and deleted /System/Library/Caches/*)