Mac OS X Yosemite Reboot Loop

Hey guys,
I just upgraded to Yosemite a couple of days ago and it was working fine. Now,while using it the OS suddenly crashed and now I can't turn it on - it makes the startup chime and the apple logo appears alogn with the bar. However, when the bar gets to about half way the computer just unexpectedly reboots. I have tryed everything I can think of and nothing works:
Cmnd+option+p+r reboot to clear RAM
Option rebot to show all drives
D reboot to check for hardware errrors
Shift reboot to enter safe mode
Pull power cord then on button for 5 seconds to reset power adapter
Each one of these did nothing to help with the startup. Am I missing something here? I have a early 2011 MacBook Pro.
Cheers,
Toast

I hope you can help me like you helped yourself..
I tried installing Yosemite on my 17 inch MacBook Pro. Was a disaster...
"cannot install on this computer" type message after about 25 min wait for scrolling...tried to simply close the install... that didn't work either...now stuck in a loop and can't get rid of the upgrade stuff... if I restart...it starts trying to install OS X again.. and another 22 min wait.. to read that it can't be installed...I don't know what to do. I am not a computer whiz.. and am scared that I may have done something to really foul things up here

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why when exiting sleep mac 2008 with yosemite reboots?

I fully understand, BDA, and I would expect it of you, being the helpful man that you are.
I just think that the less extraneous clutter in a forum, the less likely there will be posts by other stray posters in the forums.
The thing with Yosemite is that the beast is loaded with bugs and idiosyncrasies that Apple has not been able to fix yet. As we both know, Apple usually doesn't get a major new release even halfway right until the dot five update, and Yosemite is barely at 10.10.2, a very long way before 10.10.5 or 10.10.6.
Many pros at the Adobe Photoshop forums have been forced to downgrade to Mavericks as the only way to cope for now.

Mac Mini, Yosemite reboot loop (** GPU Hardware VM is disabled)

I have a mid-2011 Mac Mini that has started to reboot spontaneously. I have ruled out hard drive and replaced RAM, but this is still happening. After several of these, the machine gets stuck in a reboot loop, from which it doesn't recover. I managed to get video of it in verbose mode, and the last line is:
** GPU Hardware VM is disabled (multispace: disabled, page table updates with DMA: disabled)
I ran Linc's script, and here is the full output:
Boot Mode: Normal
System diagnostics:
   com.apple.AmbientDisplayAgent 2014-12-04-061937 crash
User diagnostics:
   fontd 2014-12-03-185502 crash
   fontd 2014-12-03-200331 crash
Kernel messages:
   Dec 8 17:18:44   BUG in process suhelperd[179]: over-released legacy external boost assertions (0 total, 0 external, 0 legacy-external)
   Dec 8 18:43:20   ** GPU Hardware VM is disabled (multispace: disabled, page table updates with DMA: disabled)
   Dec 8 18:43:21   Previous shutdown cause: -128
   Dec 8 18:43:26   BUG in process suhelperd[185]: over-released legacy external boost assertions (1 total, 1 external, 0 legacy-external)
   Dec 8 18:44:10   BUG in process suhelperd[185]: over-released legacy external boost assertions (0 total, 0 external, 0 legacy-external)
   Dec 8 19:03:52   ** GPU Hardware VM is disabled (multispace: disabled, page table updates with DMA: disabled)
   Dec 8 19:03:53   Previous shutdown cause: -128
   Dec 8 19:03:57   BUG in process suhelperd[172]: over-released legacy external boost assertions (1 total, 1 external, 0 legacy-external)
   Dec 8 19:04:51   BUG in process suhelperd[172]: over-released legacy external boost assertions (0 total, 0 external, 0 legacy-external)
   Dec 8 20:02:42   ** GPU Hardware VM is disabled (multispace: disabled, page table updates with DMA: disabled)
   Dec 8 20:02:42   Previous shutdown cause: -128
   Dec 8 20:02:46   BUG in process suhelperd[170]: over-released legacy external boost assertions (1 total, 1 external, 0 legacy-external)
   Dec 8 20:03:28   BUG in process suhelperd[170]: over-released legacy external boost assertions (0 total, 0 external, 0 legacy-external)
   Dec 9 14:53:21   Previous shutdown cause: -128
   Dec 9 14:53:25   BUG in process suhelperd[184]: over-released legacy external boost assertions (1 total, 1 external, 0 legacy-external)
   Dec 9 15:19:04   ** GPU Hardware VM is disabled (multispace: disabled, page table updates with DMA: disabled)
   Dec 9 15:19:04   Previous shutdown cause: -128
   Dec 9 15:19:09   BUG in process suhelperd[182]: over-released legacy external boost assertions (1 total, 1 external, 0 legacy-external)
   Dec 9 15:19:38   BUG in process suhelperd[182]: over-released legacy external boost assertions (0 total, 0 external, 0 legacy-external)
Total CPU usage: user 16%, system 10%
CPU usage by process "WindowServer" with UID 0: 2.5%
Extrinsic system jobs:
Extrinsic agents:
   com.plexapp.ht.helper
   com.spotify.webhelper
   com.google.keystone.user.agent
launchd items:
   Library/LaunchAgents/com.google.keystone.agent.plist
   (com.google.keystone.user.agent)
   Library/LaunchAgents/com.plexapp.ht.helper.plist
   (com.plexapp.ht.helper)
   Library/LaunchAgents/com.spotify.webhelper.plist
   (com.spotify.webhelper)
Unsigned shared libraries:
   /usr/lib/libcom_err.dylib
   /usr/lib/libdes425.dylib
   /usr/lib/libgcc_s.10.4.dylib
   /usr/lib/libgcc_s.10.5.dylib
   /usr/lib/libgssapi_krb5.dylib
   /usr/lib/libk5crypto.dylib
   /usr/lib/libkrb4.dylib
   /usr/lib/libkrb5.dylib
   /usr/lib/libkrb524.dylib
   /usr/lib/libkrb5support.dylib
   /usr/lib/liblber.dylib
   /usr/lib/libldap.dylib
   /usr/lib/libldap_r.dylib
   /usr/lib/libpython.dylib
   /usr/lib/libpython2.6.dylib
   /usr/lib/libpython2.7.dylib
   /usr/lib/libtcl.dylib
   /usr/lib/libtcl8.5.dylib
   /usr/lib/libtk.dylib
   /usr/lib/libtk8.5.dylib
   /usr/lib/python2.6/config/libpython2.6.a
   /usr/lib/python2.6/config/libpython2.6.dylib
   /usr/lib/python2.7/config/libpython2.7.a
   /usr/lib/python2.7/config/libpython2.7.dylib
Profiles:        0
User login items:
   Macs Fan Control
   Google Chrome
   Spotify
   Plex Media Server
Restricted user files:       39
Font problems:        0
Elapsed time (s): 235
The machine will run (seemingly) indefinitely in Safe Mode. Anyone have any ideas? This feels like it might be a GPU issue to me, but the fact is it does seem to have started since I upgraded to Yosemite.

Thanks Brett, but I'm quite well past all of the suggestions in that page. Hence my post.
The OS is not actually booting, and certainly isn't telling me it recovered from a crash. As I said in my post, "I have ruled out hard drive and replaced RAM, but this is still happening. After several of these, the machine gets stuck in a reboot loop, from which it doesn't recover."
I have filmed it in verbose mode in order to catch the last log line. I am able to run commands in single user mode.

Intel Mac Mini stuck in reboot loop

I just upgraded the hard drive in my 2007 intel mac mini core duo. Drive formatted successfully, contains GUID Partition Table.
OSX 10.5 installed successfully.
Machine rebooted, I ran software update to 10.5.7 successfully.
Upon installing Adobe Flash Player, Adobe Acrobat Reader, machine began to react slowly to commands.
Rebooted machine, went to Grey Apple Screen with spinning dash wheen icon.
Machine rebooted itself, once again going to the grey apply screen with the spinning wheel.
After about 15 minutes of letting the continual reboot cycle happen, I inserted the installation DVD for 10.5, held the power button in to power off the machine, and booted from the disk.
I ran disk utility. Disk Utility shows the hard drive, shows the partition (GUID Partition) correctly.
I Verified Disk, which verified as "OK"
Repaired permissions.
Restarted machine.
Once again, it loaded to the grey apple screen, stayed there with the spinning dash wheel for about 3 minutes then continued to reboot over and over (everytime it reboots it sticks on the grey apple screen for 3 minutes before rebooting.
I once again powered off the machine and reset the PRAM.
Machine stuck again on reboot cycle.
I powered off the machine and reset the mini's SMC.
Machine is still stuck in reboot cycle.
I have also taken the mini back apart and verified that all RAM and connections are seated properly.
Any advice on what to do at this point will be very helpful.

+And I promise I will not download and install a hundred different programs this time.+
Good idea.
Any time you install software in OSX, there is a small, but finite, chance that the installation process won't be able to access a needed file because it is in use. This can mess up pre-binding, or even prevent files from being updated.
So the best advice is not to run any other programs while doing software installs or updates. And when in doubt, run DiskUtility afterwards and fix permissions one more time.
I cringe whenever I think of a post I read a while back about a Mac user who boasted about what music he likes to run in iTunes while doing system software updates. Not a good idea. It's "Russian roulette" with maybe 99 blanks in the "gun", but one real bullet that can kill your Mac's installation.

My Mac G4 came unplugged while running and now when I start it up all I get is a continuous reboot loop.

While sliding my Mac G4 tower out from under the desk it came unplugged. It was running at the time. After plugging it back in all I get is a continuous reboot loop. I have tried the Shift and the Command Option P R boots to no avail. What am I missing here? I have had no problems in the past with this system. I am running Panther.

I have tried the Shift and the Command Option P R boots to no avail.
Are you using an Apple keyboard or something else. It is rather common for non-Apple boards, especially those pulled from a PC, to not respond to the traditional Apple startup key command combos.
Take the computer off wall power again then press and hold the power button for about 20 seconds. Then restore power and try a normal start. That worked for me when I had a similar failure to start with my G4 MDD.
If you have never replaced the internal backup battery ("PRAM" battery) it is, by, now surely extremely dead and it could not preserve the needed start parameters when power was unexpectedly cut. If you get the computer going, consider installing a new PRAM battery so you won't replay today's issues. tomorrow. The batteries are cheap and replacing one is a three-minute at-home job:
NewerTech 3.6v Lithium 1/2 AA PRAM Computer Clock Battery

My mac is installing yosemite and reboots but then there is no installation and the old system (mavericks) is still there?!

my mac is installing yosemite and reboots but then there is no installation and the old system (mavericks) is still there?!

Re-downloading of films is currently only available in the US (due to film studio restrictions), and not all films can be re-downloaded there as not all film studios are allowing it. Have you not got a copy of them on your computer and/or on a backup ? If not then you can try contacting Apple, but they are under no obligation to let you re-download them : http://www.apple.com/uk/support/itunes/contact/

HT6114 Reboot loop after 10.9.2 upgrade

My 2009 (dual-quad) Mac Pro 4,1 is now stuck in a reboot loop after upgrading from 10.9.1 to 10.9.2.
//edit: I realized there wasn't a question: What is wrong with my computer and how do I fix it?
So far I have tried:
* Repairing the disk
* Repairing permissions
* Zapping the NVRAM/PRAM
* Resetting SMC
* Copying BootCache.playlist from a backup to /var/db
Other things to note about my setup:
In addition to the original hard drive, I installed a 4tb drive from which I have been working with since June. It is the 4tb drive that has 10.9.2 installed. The original 650gb still has 10.8.4 installed and all my original data pre-June.
Also installed is a VisionTek Radeon 7870 video card which powers my numerous monitors. I do not recall having to install anything extra, or modify any settings to get it to work. The only downside is you can't really see anything when booting.
In addition to the VisionTek card I also have one of the factory Geforce 120 cards installed. Using another monitor attached to that card I've been able to monitor the boot process using the command-v verbose output.
Of notable interest I get the dreaded "BootCache: unable to open /var/db/BootCache.playlist : 2" error, along with a few SMC errors. If these are important I can attach pictures taken of the boot process.
I am able to zap the NVRAM and boot the old 10.8.4 650gb drive. It loads fine. 10.9.2 will not boot into safe mode, but will boot into recovery mode.
As a final attempt to fix the BootCache error I copied it from a Time Machine backup into /var/db/ ensuring the correct permissions were set. After rebooting the file is deleted again.
I would greatly appreciate any help on this issue as this is my work computer. I do have full backups via Time Machine so I can reinstall, but I'm hoping there's another solution.

I just started a discussiion related to this topic in "Mac Pro."
https://discussions.apple.com/message/25019730#25019730
" I have a 2009 dual quad core Mac Pro (4.1) with an upgraded Radeon 7950 GPU. I use a 30" Apple Cinema display (DVI) and a 27" LED Cinema Display (Display Port). After updating to 10.9.2, the Mac would not boot, but went on a continuous re-boot cycle every 5-10 minutes without a flicker of life in either display. I unplugged both displays and the Mac booted. I could log in remotely from my laptop. I then attached the 30" Cinema Display into the DVI port and the Mac booted normally."
Dave

Ps cs6 on mac. since installing yosemite, when working on an image if i want to change tool, via shortcut of wacom pen click, i now have to click on the image title bar, how can i fix this please?

ps cs6 on mac. since installing yosemite, when working on an image if i want to change tool, via shortcut or wacom pen click, i now have to click on the image title bar, how can i fix this ?

@Naiks, having suffered through unsuccessful synching attempts for Calendar and Contacts myself, l would suggest you try the following:
UNINSTALL iCloud control panel from your PC. Seems silly, but do it.
Go into Outlook, and look at the very top menu. Click FILE, then ACCOUNT SETTINGS, then click the popup box.
You will see a list of all your email accounts. Make sure that ONE of them has a checkmark against it. If not, select the account your want as your default, and click "set as default.
Exit out of Outlook and reboot your machine.
Now reinstall iCloud, check CALENDAR and CONTACTS, and do as instructed when prompted.
Reboot for good luck and now launch OUTLOOK. All that remains is to locate your iCloud Contacts and Calendar files, and make them your default.
IMPORTANT: Don't panic if you can't find your contacts -- they're there. Click CONTACTS and you'll see you have several available contact files. Locate the one label "iCloud" in grey type. Right-click on it, select PROPERTIES, then click the Outlook Address Book tab. Check the box that says something like "Make this my default Outlook Address Book." Keep clicking "apply" and "okay" until you've exited out of the dialog box maze.
You may have to do something similar with your Calendar files. I dd not, but if you need to, do it.
Everything should now sync pretty seamlessly.
I didn't have the exact same problem as you, but my dilemma was close enough. Good luck!
Arthur P. Johnson

Upgraded by Mac Pro to Yosemite 10.10.1. Upgraded iPhoto to 9.6 now cannot open iPhoto.

I have a Mac Pro running Yosemite 10.10.1. I upgraded iPhoto to 9.6 and now cannot open iPhoto. I tried several times but have to force quit. I used the time machine to go back to before the upgrade but the iPhoto copy is just the same - blank screen with the little worm continually turning.
I do not know where to start

Do you have a backup you can restore the pictures from?
Try a restart.
Do a backup, using either Time Machine or a cloning program, to ensure files/data can be recovered. Two backups are better than one.
Try setting up another admin user account to see if the same problem continues. If Back-to-My Mac is selected in System Preferences, the Guest account will not work. The intent is to see if it is specific to one account or a system wide problem. This account can be deleted later.
Isolating an issue by using another user account
Try booting into the Safe Mode using your normal account. Disconnect all peripherals except those needed for the test. Shut down the computer and then power it back up after waiting 10 seconds. Immediately after hearing the startup chime, hold down the shift key and continue to hold it until the gray Apple icon and a progress bar appear and again when you log in. The boot up is significantly slower than normal. This will reset some caches, forces a directory check, and disables all startup and login items, among other things. When you reboot normally, the initial reboot may be slower than normal. If the system operates normally, there may be 3rd party applications which are causing a problem. Try deleting/disabling the third party applications after a restart by using the application un-installer. For each disable/delete, you will need to restart if you don’t do them all at once.
Safe Mode - About
Safe Mode - Yosemite

Late 2012 Mac Desktop running Yosemite is going beyond slow...any advice?

Problem description:
MAC Desk top running Yosimite Running super super slow. minutes to do anything. late 2012 mac desk top 1 tBite harddrive
EtreCheck version: 2.1.5 (108)
Report generated 24 December 2014 9:51:14 am NZDT
Click the [Support] links for help with non-Apple products.
Click the [Details] links for more information about that line.
Click the [Adware] links for help removing adware.
Hardware Information: ℹ️
iMac (21.5-inch, Late 2012) (Verified)
iMac - model: iMac13,1
1 2.7 GHz Intel Core i5 CPU: 4-core
8 GB RAM Upgradeable
BANK 0/DIMM0
4 GB DDR3 1600 MHz ok
BANK 1/DIMM0
4 GB DDR3 1600 MHz ok
Bluetooth: Good - Handoff/Airdrop2 supported
Wireless: en1: 802.11 a/b/g/n
Video Information: ℹ️
NVIDIA GeForce GT 640M - VRAM: 512 MB
iMac 1920 x 1080
System Software: ℹ️
OS X 10.10.1 (14B25) - Uptime: 1:16:47
Disk Information: ℹ️
APPLE HDD ST1000LM024 disk0 : (1 TB)
EFI (disk0s1) <not mounted> : 210 MB
Macintosh HD (disk0s2) / : 999.35 GB (859.16 GB free)
Recovery HD (disk0s3) <not mounted> [Recovery]: 650 MB
USB Information: ℹ️
Apple Inc. BRCM20702 Hub
Apple Inc. Bluetooth USB Host Controller
Apple Inc. FaceTime HD Camera (Built-in)
Thunderbolt Information: ℹ️
Apple Inc. thunderbolt_bus
Gatekeeper: ℹ️
Mac App Store and identified developers
Launch Daemons: ℹ️
[loaded] com.adobe.fpsaud.plist [Support]
User Launch Agents: ℹ️
[loaded] com.google.keystone.agent.plist [Support]
[running] com.spotify.webhelper.plist [Support]
User Login Items: ℹ️
None
Internet Plug-ins: ℹ️
FlashPlayer-10.6: Version: 15.0.0.246 - SDK 10.6 [Support]
Flash Player: Version: 15.0.0.246 - SDK 10.6 Mismatch! Adobe recommends 16.0.0.235
QuickTime Plugin: Version: 7.7.3
Default Browser: Version: 600 - SDK 10.10
3rd Party Preference Panes: ℹ️
Flash Player [Support]
Time Machine: ℹ️
Time Machine not configured!
Top Processes by CPU: ℹ️
      2% WindowServer
      0% mds_stores
      0% apsd
      0% AppleSpell
      0% fontd
Top Processes by Memory: ℹ️
172 MB mds_stores
155 MB Google Chrome
120 MB softwareupdated
112 MB Spotlight
86 MB WindowServer
Virtual Memory Information: ℹ️
4.81 GB Free RAM
2.33 GB Active RAM
475 MB Inactive RAM
967 MB Wired RAM
2.23 GB Page-ins
0 B Page-outs
Diagnostics Information: ℹ️
Dec 24, 2014, 09:33:00 AM /Library/Logs/DiagnosticReports/Messages_2014-12-24-093300_[redacted].hang
Dec 24, 2014, 08:35:29 AM Self test - passed

Try these in order testing your system after each to see if it's back to normal:
1. a. Resetting your Mac's PRAM and NVRAM
    b. Intel-based Macs: Resetting the System Management Controller (SMC)
2. Restart the computer in Safe Mode, then restart again, normally. If this doesn't help, then:
Boot to the Recovery HD: Restart the computer and after the chime press and hold down the COMMAND and R keys until the Utilities menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
3. Repair the Hard Drive and Permissions: Upon startup select Disk Utility from the Utilities menu. Repair the Hard Drive and Permissions as follows.
When the recovery menu appears select Disk Utility. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the main menu. Select Restart from the Apple menu.
4. Reinstall Yosemite: Reboot from the Recovery HD. Select Reinstall OS X from the Utilities menu, and click on the Continue button.
Note: You will need an active Internet connection. I suggest using Ethernet if possible
            because it is three times faster than wireless.
5. Reinstall Yosemite from Scratch:
Be sure you backup your files to an external drive or second internal drive because the following procedure will remove everything from the hard drive.
How to Clean Install OS X Yosemite
Note: You will need an active Internet connection. I suggest using Ethernet if possible
            because it is three times faster than wireless.

MAC OS X Yosemite scanning from Photosmart 5520

Hello, I updated my MAC to OSX Yosemite version 10.10 and my HP Photosmart 5520 printer stopped scanning. I uninstalled the HP software and reinstalled it but the HP Utility keeps saying, "HP utility has quit unexpectedly, a report as been sent to Apple". It comes on for a quick second as if something is blocking it. I tried to turn off my firewall but it still did not work. I saw another post that they suggested to download 10.9 from the HP drivers and software, that still did not work. My printer says the software is not installed on my computer. I am also using a USB cable,, not wireless. Thanks!
This question was solved.
View Solution.

Hello @kendeebrad,
Welcome to the HP Forum,
I see you lost the ability to scan via USB from your Photosmart 5520 to your Mac after upgrading to 10.10.
I would like to help you with this issue.
Have you verified and repaired the disk permissions?
I would uninstall the software again, then verify and repair the disk permissions.
After that check for any apple updates.
next, reboot the Mac. when it has started up again, goto hp.com.
From here download the most upto date drivers for the photosmart 5520.
Install the drivers again and test the scan feature.
If this does not work, I recommend calling our technical support at 800-474-6836. If you live outside the US/Canada Region, please click the link below to get the support number for your region. http://www8.hp.com/us/en/contact-hp/ww-phone-assist.html
Aardvark1
I work on behalf of HP
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos Thumbs Up" on the right to say “Thanks” for helping!

IPod touch 4g 6.1.6 stuck in reboot loop after trying to restore

My ipod touch 4g has a really bad battery and only works if you have it plugged in and charging, but I've never had this problem before. I unplugged it from where it was charging and it died, of course. But when I plugged it into my computer to sync it, it started an endless reboot loop with the apple logo. I tried putting it into dfu mode and restoring it, I've tried doing it on three other macs, and the I've let the battery drain since it dies when I unplug it. Still dont know what the problem is. I cant take it to apple cause I dont have apple care on it and they cant help because the battery doesnt work anyway. Help is much appriciated.

See if y misse anything here:
- iOS: Not responding or does not turn on
- Also try DFU mode after try recovery mode
How to put iPod touch / iPhone into DFU mode « Karthik's scribblings
- If not successful and you can't fully turn the iOS device fully off, let the battery fully drain. After charging for an least an hour try the above again.
- Try another cable
- Try on another computer
- If still not successful that usually indicates a hardware problem and an appointment at the Genius Bar of an Apple store is in order. You do not need AppleCare and it is free.
Apple Retail Store - Genius Bar

Iphone 4 restart / reboot loop - and restore error 9

my iphone 4 ios 6 suddanly startted the restart / reboot loop, then when i tried to restore it i got itunes error 9 !!!
i tried with 3 diffrent cables and on mac osx 10.8.2 and win 7
please help me....

thanks,
but your link is broken and i read everything i could find about error 9 and restart looping
i tried all of the suggestions made in those articles - this is why a posted this post and wrote about:
tried to restore it i got itunes error 9 !!!
i tried with 3 diffrent cables and on mac osx 10.8.2 and win 7

Iphone keeps going into reboot loop

Hey guys, i dropped my iphone from 1 month ago and since it, the signal went away sometimes while it was charging and when i took the stick out my iphone went into reboot loop, then i just waited some time and it went back.
Now suddenly 2 days ago, my iphone keeps going into reboot loop everytime and when i get it out then around 9hours later, it comes again..
I really need help since it affects my school, when the alarm don't work in the morning.
TLDR; Iphone keeps going into reboot loop, need help!

Have you got the latest 1.1.4 software installed, along with the latest version of iTunes?
Have an iPhone or iPod touch? Enter Mac611.com in Safari on it for 'mobile Mac support.'
Disclaimer required by Apple Discussions Terms of Use: Mac611 may receive some form of compensation, financial or otherwise, from my recommendation or link.

IPod Classic 160GB Reboot loop BUT Disk Mode Works!

I have searched the internets and have yet to find someone with the same problem as me.
I have an iPod Classic 160GB which is stuck in a reboot loop (apple logo appears for 10 seconds, then restarts again). This happened shortly after using it as a disk to transfer a file from a Linux machine to a PC. This is probably not the culprit though as I have done this many times.
The reboot loop continues and neither windows nor a mac will recognize the iPod until I put it into disk mode. When I do this, it functions perfectly. I can move files to/from the disk, add songs in iTunes and then play them from the iPod. I am able to restore the iPod but when it tries to complete the process it goes into the reboot loop.
So, in brief, I have tried:
1) Resetting the iPod (duh).
2) Restoring it using iTunes while in disk mode on a Mac and a PC.
3) same as above but manually choosing an older firmware version.
4) Manually formatting the drive using a Mac and a PC.
So perhaps there is something wrong with the iPod that is not hard drive-related or there is something wrong with the firmware partition. Needless to say, I'm baffled.
Answers such as "Send it back to Apple." or "You're screwed, it's a brick." will not be considered helpful unless they accompanied by an explanation.
Thanks in advance.

Some more info:
I can get into diagnostic mode by pressing select and REV, but I can't force a disk scan by pressing MENU, SELECT, REV, and FFW.
Any help?

Mac OS X Yosemite Reboot Loop

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