MacPro 2013 Yosemite -- won't start up, monitor never turns on, repeatedly reboots itself

I don't know how someone came up with this idea, but it worked for me.

Try to hold COMMAND+OPTION+P+R after a chime, hold until you hear the second chime and release. It will reset some internal stuff and issue will be resolved.

Thank for checking in Charlie - I've continued to have "gremlins", and the option re-boot didn't solve it, so I am reverting back to 10.9.4 till the "point 1" itineration hopefully addresses this. The trash can Mac is my main work box so I just can't afford the time right now to fiddle with it - but hey, 4 out of 5 winners, right? And, the old Mac pro with 2 monitors and an SSD boot card in the PCI slot........works flawlessly - who knew?

;-)

Michael

FYI everyone, the re-setting of the P-Ram didn't solve it for me either.

Michael

(A little update from Michael),

My Mac pro 6,1 (duh) is my main computer for work, so why I chose to head out tot he bleeding edge I'm not sure - I've reverted to 10.9.4 (Thanks Superduper!), effortlessly and all is good for now - I guess I'll wait for 10.10.1 Yosemite, and hope they squish this bug.....

That was the ONLY change I made to my Trash Can MacPro, and clearly there is some kind of bug in 10.10/ 6,1 Mac - no problems though - I recommend everyone have a backup plan, and you can stay productive.

Michael

I would usually reading of these issues (and I know something fishy / funny is going on when upgrading to Yosemite) assume it has to do with either...

Yosemite changed the partition table(s) and layout, added new features, the directory is not what it should.... something

I would prefer seeing Yosemite treated for what it very well may be... "the dot zero child that is shrink-wrap beta now" and no longer just public beta but not the "dot two or above" (.2 or .3 actually seem to be where OS X releases seem to be out of the woods yes out of the woods!

Also to boot from your installer you created and (after having a clone and a full timemachine backup of course) FORMAT and do a clean install on the drive you hope to run 10.10 from

We assume the update/upgrade process is safe and perfect, nothing left in the system that should not be there, the disk drive verified and deemed worthy of being installed on.

OS X often has changed the layout and specs implemented for GUID and for HFS+ ---- so maybe something can go WRONG terribly wrong in the process on some systems. But not enough to raise red flags or have been flagged during testing?

Lots of good advice here, but I've tried everything with my Mac Pro (2009) - yes, I know it's quite old but was working perfectly well with 32gb of RAM.

When I try to boot up now, my hard drive goes into 'fury' mode, making a godawful racket. I've tried a hard reboot five times now, to no avail, so can't even access my back-ups or anything. When I try Mac Support pages, they just keep rolling me onto the enter serial number loop. I'm sure I wrote it down somewhere a few years back, but buggered if I can find it now.

How can Mac release an update that can totally destroy my machine.

Sooo much work to do, but now So screwed. And I was thinking of buying a new Pro soon, too.

Any suggestions (that don't involve a pick axe)?

My Mac Pro is 3+ yrs older and still works fine. But, I change out and low level zero drives.

Your drive and directory sounds like it is caput or at least the directory is.

Even if DU Disk Repair says it is fixed or nothing it could fine, zero it and use it for a spare only.

When drives make those funny noises it can be bad sector if not the directory.

And of course most users are finding their way to a SSD for the system.

We have the new black MacPro 6 core here at work. Were digitizing some footage and the external LaCie drive we use for mass storage of footage it was writing to got unplugged accidentally. Machine would not boot back up after it hung in Final Cut Pro X.

I dearly wish to thank those that suggested unplugging the extra monitor. That did the trick and we're good to go.

Phew! That was scary Apple. Please make this work better.

This may not help many people, but I was also having a lot of difficulties with my trashcan Pro and Yosemite. I had about given up and made a Genius Bar appointment, when I decided to hit return a bunch of times on the black screen. And ESC. And stuff like that.

Finally, the black screen flipped into another screen with a progress bar. That bar took maybe 7 minutes, and then the computer booted (correctly) into Yosemite. No problems since.

I know it's about the last thing anyone wants to read on here, but aside from the single-monitor trick, we may just need to keep rebooting and waiting and eventually it kinda works. Sigh.

Stuart

I startup my computer, then I hear the chime, then I get a black screen, also sometimes I get to see the screen Reset Password, then I have 3 options, but when clicking any option and then restarting results in a black screen. Is this Yosemite fault or are many people experiencing this problem? It probably has something also to do with Filevault. I actually think it is due to the upgrade of Yosemite, but more people should post their problem in order to see if it is Yosemite or not. Now apple wants me to wait for a week for service. They should give better service, because it is strange if I have to wait a week to be able to have an appointment in an applestore, when it is probably their mistake, and then in the store I probably have to wait even longer, before they fix the problem.

As I mentioned earlier, I needed to work with my Trash Can Mac every day, usually 4-6 hours editing images; my decision was to revert to 10.9.4 which is very stable with 3 monitors and has no booting issues (knock wood). That's just a business decision - I'm not in the IT business - I take pictures for a living.

I would have to conclude it IS Yosemite - no other change took place, and reverting simply solved those problems introduced with Yosemite 10.10

I'll let apple sort it out.

Michael

Thanks SO MUCH for this solution, which unlike all the others presented here fixed the problem!

I had the same issue (dark screen) after turning on Yosemite's FileVault on my 2013 Mac Pro.

It seems that turning on FileVault makes Yosemite lose track of monitor ICC profile file.

After booting up (and a dark screen), I used Share Screen to gain control of Mac Pro 6,1 from another Mac,

login, entering System Preferences --> Display to re-select the correct profile file. This seems to fix the

dark screen issue.

My $.02.

nurrrrrikOct 21, 2014 6:42 PM Re: MacPro 2013 Yosemite -- won't start up, monitor never turns on, repeatedly reboots itself
Re: MacPro 2013 Yosemite -- won't start up, monitor never turns on, repeatedly reboots itselfin response to ccano

I don't know how someone came up with this idea, but it worked for me.

Try to hold COMMAND+OPTION+P+R after a chime, hold until you hear the second chime and release. It will reset some internal stuff and issue will be resolved.

This worked for me, thanks, you saved me a three hour round trip to an apple store