Mountain Lion sending fans into overdrive?

I upgraded to Mountain Lion yesterday. Ever since, even if I only have one small app running (like MSN or Reminders), my fans seem to be going very loudly and my computer is getting warm. Has anyone else experienced this? How can I fix this?
15-inch, Mid 2010
2.66 GHz Intel
Using about 140GB of storage (of 500)

before i try this, just to clarify- this is what i'm seeing
is an SMC reset still the best course of action?

Similar Messages

Trying to restore a Mountain Lion caldav.sql into a fresh/clean Mavericks installation

Call me cynical, but upgrades and Migration Assistant were never my thing. I'm starting to experiment with migrating some of my Mountain Lion OS X Servers to Mavericks.
Under OS X Server 2.2.x (Mountain Lion), I had a script that would individually backup the postgres_server databases, caldav, collab, device_management, etc.
I'm now working with a clean Mavericks installation and trying to restore the caldav db. Through the help of ~morgen, I've worked out that caldav seems to have its own postgres instance and I can see and view the fresh caldav database there:
/Applications/Server.app/Contents/ServerRoot/usr/bin/psql -U caldav -h /var/run/caldavd/ccs_postgres_3d403b3009fe0c830944d87bd751fbe9/ caldav
So, I backed that up before proceeding with:
/Applications/Server.app/Contents/ServerRoot/usr/bin/pg_dump -U caldav -h /var/run/caldavd/ccs_postgres_3d403b3009fe0c830944d87bd751fbe9/ -c caldav | gzip -c > /Library/Server/Backups/PostgreSQL/caldav.sql.gz
And then tried to use dropdb to drop it, so I could use createdb to re-create it and then use psql to suck in my Mountain Lion backup. The three intended commands in order would have been:
/Applications/Server.app/Contents/ServerRoot/usr/bin/dropdb -U caldav -h /var/run/caldavd/ccs_postgres_3d403b3009fe0c830944d87bd751fbe9/ caldav
/Applications/Server.app/Contents/ServerRoot/usr/bin/createdb -U caldav -h /var/run/caldavd/ccs_postgres_3d403b3009fe0c830944d87bd751fbe9/ caldav
/Applications/Server.app/Contents/ServerRoot/usr/bin/psql -U caldav -h /var/run/caldavd/ccs_postgres_3d403b3009fe0c830944d87bd751fbe9/ -d caldav < /Library/Server/Backups/PostgreSQL/caldav.sql
HOWEVER.... the first command failed:
dropdb: database removal failed: ERROR: database "caldav" is being accessed by other users
DETAIL: There is 1 other session using the database.
Interestingly, even though neither Calendar nor Contacts server are running, there's quite a bit running under _calendar:
_calendar         656   0.0 0.1 2471756   4412   ?? Ss    6:53pm   0:00.03 postgres: caldav caldav [local] idle
_calendar         651   0.0 0.0 2471120   2228   ?? Ss    6:53pm   0:00.11 postgres: wal sender process caldav [local] streaming 0/422E020
_calendar         650   0.0 0.0 2460732   2216   ?? S     6:53pm   0:00.07 /Applications/Server.app/Contents/ServerRoot/usr/bin/pg_receivexlog -h /var/run/caldavd/ccs_postgres_3d403b3009fe0c830944d87bd751fbe9 --no-password --directory /Library/Server/Calendar and Contacts/Data/Database.xpg/backup --verbose
_calendar         649   0.0 0.0 2491744   1496   ?? S     6:53pm   0:00.02 /usr/sbin/distnoted agent
_calendar         646   0.0 0.0 2465500    652   ?? Ss    6:53pm   0:00.19 postgres: stats collector process
_calendar         645   0.0 0.0 2465500    416   ?? Ss    6:53pm   0:00.02 postgres: archiver process
_calendar         644   0.0 0.0 2470988   2460   ?? Ss    6:53pm   0:00.12 postgres: autovacuum launcher process
_calendar         643   0.0 0.0 2470856    560   ?? Ss    6:53pm   0:00.06 postgres: wal writer process
_calendar         642   0.0 0.0 2470856   1240   ?? Ss    6:53pm   0:00.09 postgres: writer process
_calendar         641   0.0 0.0 2470856   1056   ?? Ss    6:53pm   0:00.01 postgres: checkpointer process
_calendar         639   0.0 0.0 2455256    400   ?? Ss    6:53pm   0:00.01 postgres: logger process
_calendar         638   0.0 0.1 2470856   5272   ?? S     6:53pm   0:00.08 /Applications/Server.app/Contents/ServerRoot/usr/bin/postgres_real -c listen_addresses= -k /var/run/caldavd/ccs_postgres_3d403b3009fe0c830944d87bd751fbe9 -c shared_buffers=105 -c max_connections=70 -c standard_conforming_strings=on -c log_lock_waits=TRUE -c deadlock_timeout=10 -c log_line_prefix=%m [%p] -c logging_collector=on -c log_truncate_on_rotation=on -c log_directory=/var/log/caldavd/postgresql -c log_filename=postgresql_%w.log -c log_rotation_age=1440
_calendar         636   0.0 0.0 2492336   2832   ?? S     6:53pm   0:00.04 /System/Library/PrivateFrameworks/TCC.framework/Resources/tccd
_calendar         634   0.0 0.2 2472760 16104   ?? S     6:53pm   0:02.17 /usr/bin/python /Applications/Server.app/Contents/ServerRoot/usr/bin/xpostgres -c listen_addresses= -k /var/run/caldavd/ccs_postgres_3d403b3009fe0c830944d87bd751fbe9 -c shared_buffers=105 -c max_connections=70 -c standard_conforming_strings=on -c log_lock_waits=TRUE -c deadlock_timeout=10 -c log_line_prefix=%m [%p] -c logging_collector=on -c log_truncate_on_rotation=on -c log_directory=/var/log/caldavd/postgresql -c log_filename=postgresql_%w.log -c log_rotation_age=1440
_calendar         630   0.0 0.0 2471388    900   ?? Ss    6:53pm   0:00.20 /sbin/launchd
So, how can I gently get this mystical one user off of the DB in order to do this? OR, how can I start up calendar in such a way that this mythical user is not connected?
If I unload this job:
launchctl load /Applications/Server.app/Contents/ServerRoot/System/Library/LaunchDaemons/org.calendarserver.agent.plist
I can no longer access the postgres instance in order to drop and create the db.
Any other ideas / suggestions / solutions?

If you knew your sql, I don't think it would be insurmountable to pull apart the full dump.
As to the upgrades in place, here's some of the output in caldav's error log every startup:
2013-12-02 21:29:02+1000 [-] [txdav.common.datastore.upgrade.sql.upgrade.UpgradeDatabaseSchemaStep#warn] Beginning database schema check.
2013-12-02 21:29:02+1000 [-] [txdav.common.datastore.upgrade.sql.upgrade.UpgradeDatabaseSchemaStep#warn] Required database key VERSION: 24.
2013-12-02 21:29:02+1000 [-] [txdav.common.datastore.upgrade.sql.upgrade.UpgradeDatabaseSchemaStep#warn] Actual database key VERSION: 24.
2013-12-02 21:29:02+1000 [-] [txdav.common.datastore.upgrade.sql.upgrade.UpgradeDatabaseSchemaStep#warn] Schema version check complete: no upgrade needed.
2013-12-02 21:29:02+1000 [-] [txdav.common.datastore.upgrade.sql.upgrade.UpgradeDatabaseSchemaStep#warn] Database schema check complete.
2013-12-02 21:29:02+1000 [-] [txdav.common.datastore.upgrade.sql.upgrade.UpgradeDatabaseAddressBookDataStep#warn] Beginning database addressbook data check.
2013-12-02 21:29:02+1000 [-] [txdav.common.datastore.upgrade.sql.upgrade.UpgradeDatabaseAddressBookDataStep#warn] Required database key ADDRESSBOOK-DATAVERSION: 2.
2013-12-02 21:29:02+1000 [-] [txdav.common.datastore.upgrade.sql.upgrade.UpgradeDatabaseAddressBookDataStep#warn] Actual database key ADDRESSBOOK-DATAVERSION: 2.
2013-12-02 21:29:02+1000 [-] [txdav.common.datastore.upgrade.sql.upgrade.UpgradeDatabaseAddressBookDataStep#warn] Addressbook data version check complete: no upgrade needed.
2013-12-02 21:29:02+1000 [-] [txdav.common.datastore.upgrade.sql.upgrade.UpgradeDatabaseAddressBookDataStep#warn] Database addressbook data check complete
To be clear, I don't believe its Server.app. Each of these services stores its schema version IN the database and its checked every startup, and it would appear, that each service knows how to perform that upgrade at each startup.

Mountain Lion only boots into Recovery mode after using iCould lock

Hi everyone!
I have searched the forums for hours now, but I can't seen to find an answer to my question, so I'd like to ask it.
Recently my system partition failed due to frequent kernel panics caused by a cable in the screen I think. The kernel panics still occur, but I don't know what to do with them.
I managed to save my files and reinstall my osx, which is Snow Leopard (the disc came with the computer). Then I wanted to install my purchased copy of Lion through Appstore, but it said it's no longer available in my country and I couldn't download it again.
Then I decided to buy a copy of Mountain Lion which I tried to install. I managed to do it, and I tried to explore my new operation system.
I tried the iCloud app as well, including the Lock. It locked the computer, and rebooted, but ever since I couldn't unlock it.
When it asks for the password I enter it and it accepts it, but doesn't unlock, only lets me into Recovery mode. Now I reinstalled the whole thing over again and when the Mountain Lion install finishes, it only boots into the Recovery HD without asking.
So if I reboot my computer, no matter what I do it only boots into Recovery Mode.
Please help!!
Mike

I was afraid the Apple Store wasn't going to be an option.
Based on your previous post, I was under the impression you could download Mountain Lion, but when you installed it, it locked up again. Not true?
I don't know how to remove it. You can try contacting Apple support through the link below to see if they can help you get this unlocked.
Apple Support Contact
Are the kernal panics new since all this happened?
Here is some information about kernal panics.
Kernel Panics - About
Kernel Panics - Avoiding and Eliminating
Kernel Panics FAQ
Kernel Panics FAQ (2)
Kernel Panics - Understanding and Debugging
The articles discuss where kernal panic reports are filed. After you have a kernal panic, copy the report and post it here. Please copy and paste rather than using a screen shot. There are several people who can read them and they can suggest what to do next. Reading kernal panic reports isn't something I've totally figured out yet.

After Mountain Lion my fans keep running - why?

After loading Mountain Lion, my iMac 20-inch, Early 2009, like very many people I have read on the blogs, I found it had it's fans running full speed quite regularly after I put it to Sleep.
Many blogs hoped the 10.8.1 update would sort it.
It hasn't - and as I sit here they are running as though it's doing intensive gamig on a hot day (which it isn't).
This is a real pain in the proverbial, as the only way I can find to stop it is to Reboot. Very tedious. Very non-Apple.
Has anyone found a way to stop the fans other than by a Restart?
This would at least dgive temporary respite until Apple get round to curing the problem.
I would add I have had my iMac three years and it never did it under Snow Leopard or Lion.
Help!

It doesn't sound like it, but you might try adding a different DNS server.
In Network System prefs, select the network service you use (ethernet or WiFi).
Click on Advanced.
Click on DNS tab.
Click the + button
Enter these numbers:
For OpenDNS: 208.67.222.222 and 208.67.220.220
Or Google: 8.8.8.8 and 8.8.4.4

IMessage on Mountain Lion sending broken links to iOS

OS 10.8.4 iMessage (Jabber Account [Gmail?]) is not sending links to iOS correctly. They are a long mangled mess that the recipient cannot click on. I have tried using URL shortening services but the same think occurs. The link is repeated about 15 times and broken. I receive links from iOS iMessage perfeclty fine. Any ideas?

Hi,
There seems to be some confusion here.
A Jabber account in Messages cannot send to iMessages contacts.
Do you mean that your Apple ID used in Messages for your iMessages account is actually a Google email ?
I typed a piece of text (two words) and then highlighted them and used the CMD + k key option in the Edit Menu to add a link.
A dialogue box pops up and you can add the Link and the two words become a Link.
I then sent it to my iPhone (or at least tried to)
The actual iMessages appeared as a synced Message as well in the Mac Messages app main window as being sent back from the iPhone.
On the iPhone itself it only appeared as plain text.
For me sending a link as Plain text arrives as a link at the iPhone.
This link worked despite being long and forced over three lines of text on the iPhone.
You could of course be using Google Login on a Browser on the iOS devices and chatting that way
You could have found a Jabber app for the iPhone and be using that.
In both these cases you would be sending from the Google Account in Messages.
9:13 PM Tuesday; June 25, 2013
 iMac 2.5Ghz 5i 2011 (Mountain Lion 10.8.4)
 G4/1GhzDual MDD (Leopard 10.5.8)
 MacBookPro 2Gb (Snow Leopard 10.6.8)
 Mac OS X (10.6.8),
 Couple of iPhones and an iPad
"Limit the Logs to the Bits above Binary Images."  No, Seriously

Mountain Lion installer boots into recovery partition

Strange thing: being a registered devloper I downloaded the OS X Mountain Lion (10.8.2) installer and wanted to upgrade one of my Mac minis (which was running 10.7.5).
However, the aluminum mid-2010 Mac mini acts strange: I copied the installer onto a USB stick and burned it onto a DVD, too. Tried to install from both media but the Mac mini boots either into the Mountain Lion recovery partition (so that was somehow created) or the Setup assistant lacks entries in lists and always jumps to step 1 after step 3 or 4 in an endless loop.
Once -- when I wanted to select the 10.8.2 OS X as boot volume -- I got an error message that boot caches can't be created so I can't set this partition as boot partition.
I've got app. 100 GB free on the Mac minis hard disk.

I was afraid the Apple Store wasn't going to be an option.
Based on your previous post, I was under the impression you could download Mountain Lion, but when you installed it, it locked up again. Not true?
I don't know how to remove it. You can try contacting Apple support through the link below to see if they can help you get this unlocked.
Apple Support Contact
Are the kernal panics new since all this happened?
Here is some information about kernal panics.
Kernel Panics - About
Kernel Panics - Avoiding and Eliminating
Kernel Panics FAQ
Kernel Panics FAQ (2)
Kernel Panics - Understanding and Debugging
The articles discuss where kernal panic reports are filed. After you have a kernal panic, copy the report and post it here. Please copy and paste rather than using a screen shot. There are several people who can read them and they can suggest what to do next. Reading kernal panic reports isn't something I've totally figured out yet.

How do I import my Mountain Lion Contacts list into Maverick

I updated my Macbook Pro from Mountain Lion to Mavericks and I was able to get everything working except the contacts list. In Mountain Lion I had my contacts listed populated but my Maverick contacts list is empty. For some reason the updated system no longer finds the contacts list which was used in Mountain Lion but it must be on the disk somewhere. Where do I find it and how do I get the Maverick Contact application to read OR import the Mountain Lion Contact list? (I do have a time machine backup).

Megan,
Do a Mail Merge from AddressBook to a Pages Document. The User Guide has details on doing the merge.
After you get the merged document, there will be only one contact per page, but that's easy to fix by doing a search and replace to get rid of the Section Breaks.
Jerry

QuickTime 7.1.6 hogs CPU, sends fans into panic mode

I use QuickTime with Flip4Mac to download streaming audio files in Windows Media (.wma) format. I dutifully upgraded to QT 7.1.6 when it came out (ca. May), and suddenly found my MacBook Pro's fans coming on. I opened Activity Monitor and QuickTime was eating up the CPU. It started small, but gradually built up, until at about 9MB of a 27MB file QT was using over 99% of the CPU, and the computer's fans were in high gear.
I laboriously downgraded to QT 7.1.5, and the problem was solved. I thought it might have been something else in my System setup, which was getting funky; so when I upgraded my hard disk last night I did a complete fresh install of 10.4.9 etc., including QuickTime 7.1.6 (and the latest Flip4Mac). Now I find QuickTime doing it again; at 11MB downloaded of a 27MB file it's steadily hogging 98-99+% of CPU, running the fans at full speed, and making some other functions sluggish.
Anyone else run into this behavior? Any solutions -- any way to tell QuickTime it doesn't have to run in desperation mode? It used to do just fine before 7.1.6; I never noticed how much CPU it was using, but it never triggered the fans. I really hate when the fans run like this; it feels like the computer's being overdriven.
BTW, I also sometimes use an iBook G4 1GHz, running 10.3.9 & QuickTime 7.1.3, to do the same downloading chore, and it has no problem. It's really not hard work -- at least for any version of QT before 7.1.6.
MacBook Pro 17" 2.16GHz Mac OS X (10.4.9) 2GB RAM, 120GB HD, SuperDrive

I encountered a kernal panic for CPU 0) unable to find driver for this platform: "PowerBook 5,2")
I believe that driver is munged on the HD, or the HD is munged, seen several just like that on 2.5" drives, never on a 3.5"er btw.
If you can copy/retrieve your important data, I think you need to Zero the internal HD & start over, though if Permissions get repaired on it, you might try a reinstall of the latest big Combo Update... 2nd an Archive & install.

Plugging in MacBook sends fans into full drive.

I've just upgraded MacBook Pro to the latest model. Ive noticed that on the new model when I plug my MacBook into the power socket the fans slowly start to speed up they take about 5-10 minutes to get to a really high and LOUD level. As soon as I pull the power cord out you hear the fans slowly start to slow then when plugged back in they speed up again. Is this normal?

I'm no expert, but it doesn't sound normal to me. Fans are supposed to sense heat and turn on when the computer starts getting too hot. If they turn on when you connect the power adaptor, especially if the computer has been off and is cold, I would suspect that there might be a problem with the temperature sensors or something like that. You might try running the Apple Hardware test and see if it shows anything.
But since you just upgraded, you should be under warranty and should be able to get this taken care of at no expense to yourself.
Good luck!

Trouble backing up HDD in Mountain Lion Recovery Mode into external hardrive

My Macbook Pro that's only more than 3 months old is stuck in the grey screen with the apple logo, so I'm stuck in OS X Recovery Mode. While I've tried ressurecting it using safe boot or the fsck command, it's simply not working. I've decided to just reinstall the OS X, but I think there's still something wrong with my HD that's preventing the OS to be reinstalled.
I'm planning on doing an Erase & Reinstall AFTER I back up my HD to one of my two external hardrives. But while on disk utility & using the Restore tab to copy the contents of my HD to my external hardive, it says that it "Could not validate source - error 254". When I tried erasing the contents of my external first, it says "Disk erase failed. POSIX reports: the operation could not be completed. input/output error."
What should I do in order to be able to backup my HD to one of my external hardrives?
WIll erasing/reformatting my HD let me reinstall OS X via Internet Recovery mode?
Please help! I'm really hoping I'd be able to save my files without resorting to spending cash for file recovery programs. And I need to be able to use my laptop again soon.

Since youre not at all familiar with doing that, I wouldnt recommend you doing that.
Make a service call to Apple for diagnostic / repair. Are you under warranty?
Well, your laptop is ONE thing, the HD is another. There are only 4 HD makers on earth, and all the pros work from the premise that their HD is going to crash and fail at anytime, all the time. Even the very best made ones.
Consider these 2 points for the future:
Never consider any computer a data storage device at any time under any circumstance, rather a data creation, sending, and manipulation device. Anyone who thinks data is safe on any computer, even copied upon multiple partitions is making a mistake that will, without fail, strike.
Most importantly know that 2 copies of your data is 1, and 1 is none.
“My computer is OK, therefore so too is my data"
Literally thousands of times, regardless of make or model of computer I have heard “my data I have spent months on is all gone”; or likewise “my computer with priceless data was stolen/in a fire and the backup (singular) was with it and is gone too”. When we fail to plan, we are planning for certain failure in neglecting data redundancy. At the very minimum of $10,000 a month, anyone who has lost ‘months’ worth of data has trusted a very valuable payload, sometimes $100,000+ of work at the end of a very weak chain.
How so very weak? All HD/SSD, even the very highest of quality, are at best considered ephemeral by professionals and a single backup is merely a rope in the case of a ‘fall’, as in the case of drive failure. In addition to a rope your data needs a net and additionally a cushion underneath it all for safety to be considered in place.
None of us would consider working hard for months and then taking the money from that work and placing it on the curb in a paper bag; yet most people never second guess leaving that level of work on our computer drive or a single backup. Separation in place and unassailable redundancies is mandatory. It takes a matter of mere minutes to safeguard priceless data, therefore proper consideration and action needs to be taken.

After latest update Mountain Lion, fan never stop working!

Hi all
After latest update (26/9/2012 in my case) of Mountain Lion, the fan start working and never stops (Macbook pro 5,5).
Any other have sam issue?
Already tried to reboot SMC and delete everything starting from snow leopard but problem still exist!!!
Thanks.

I keep an old wired keyboard and wired mouse for just such emergencies, but that is not helping you now. There are at least a couple of things that could account for the disappearance of the Bluetooth preference pane.
There may have been a glitch in the installation.
The preference pane will not be displayed if the bluetooth transceiver was not detected when the computer started.
This may seem too obvious, but try completely powering down using the power button on your Mac mini. Wait at least 30 seconds for everything in the mini to fully discharge. While you are waiting to restart, check/replace the batteries in your wireless keyboard and mouse or trackpad. Restart using the power button on the Mac mini.
If that does not work almost anything else will require the use of a wired keyboard and mouse. For years I have kept a wired keyboard and mouse around for just such an emergency, but in a fit of spring cleaning they were discarded. I ended up having to buy a cheap USB mouse and keyboard at Radio Shack (under $20 for the pair but no command key). But, with any kind of luck, you should be able to borrow a wired keyboard and mouse to get this fixed. Once you have a functioning keyboard and mouse you could...
Be sure Bluetooth is turned ON in System Preferences
Install the OS X 10.8.4 (Combo) updater or
Boot into the recovery drive (Reboot while holding down Command + R) and reinstall OS X 10.8.4

2007 MacBook Pro Doesn't like Mountain Lion-- Loud, incessant fan.

Since updating my 2007 Macbook Pro to Mountain Lion, the fan won't stop running loudly. The CUP% looks normal (nothing over 10) and I am only running google chrome. Is this a common problem? is there a common fix?

I fixed the issue. I researched many many forums and found no help on any of them, and sorry-no help on this one either.
What solved the issue - and I hope this helps someone else who has the same problem:
1). Install new hard drive (with or without osx pre installed)
2). Remove all ram
3). Power on and wait 1 minute
4). Hold power button until it turns off
5). Install ram
6). Power back on
7). BOOM! It works again.

Late 09 MB Pro 13" now on Mountain Lion keeps crashing (spinning wheel) and getting VERY hot. Even Safe Mode slow to work. Managed a back up last night and wondering should I put the original ios disc back in to take it back to SL. Advice appreciated!

Hi
For past year or so my mac book has been getting gradually worse. Spinning wheel, and overheating, last night I had trouble just getting it to start in Safe Mode (been using the on/off button a lot lately!)
Problem may be related to media - iMovie followed by iPhoto are the most likely programs to bring everything to a stop but not always.
I'm not an expert although I did figure out how to re install the operating system from the partition with help from this forum a couple of months ago but it didn't fix the problem.
The iOS is Mountain Lion (via Lion)
I managed to do a back- up last night and now wondering if I should re- install Snow Leopard from the original discs that came with the laptop.
Got a lot of media on there (replaced the 250gb drive with a Samsung 1tb a while back which is less than half full.
Never had to use any of my back-ups before so:
If I re install the original operating system will I be able to be selective in what I put back on later?
and -
Will there be any issues putting a Mountain Lion back-up into a Snow Leopard iOS?
A lot of whats there isn't needed but don't want to lose it completely.
Advice appreciated thanks

Back up all data immediately as your boot drive may be failing.
If you have more than one user account, these instructions must be carried out as an administrator.
Triple-click anywhere in the line below on this page to select it:
syslog -k Sender kernel -k Message CReq 'GPU|I/O' | tail | open -ef
Copy the selected text to the Clipboard (command-C).
Launch the Terminal application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Terminal in the icon grid.
Paste into the Terminal window (command-V).
The command may take a noticeable amount of time to run. Wait for a new line ending in a dollar sign (“$”) to appear.
A TextEdit window will open with the output of the command. Normally the window will be empty. If you get output like this:
kernel[0] <Debug>: disk0s2: I/O error
the boot drive is failing, or there's some other hardware fault in the storage subsystem.
If you get output like this:
kernel[0] <Debug>: ** GPU Debug Info Start **
kernel[0] <Debug>: ** GPU Debug Info End **
there's a fault in the graphics processor or logic board. The two kinds of output are not mutually exclusive, but if you get both, a logic-board fault is likely.

Can I dual boot Snow Leopard and Mountain Lion on one hard drive?

I want to make a new partition and be able to boot to either OS. Is this possible, if so, how? I would think just make a new partition and install the dmg file to that new partition.

@jimmyk11: AppleCare has actually informed me that "No - this MacBooPro9,1 cannot boot Snow Leopard".
It originally came with lion 10.7.4 installed. I have since upgraded to Mountain Lion 10.8 and (today, after a week or so of ML) I reverted to Lion 10.7.4. But now I find I can no longer boot into Lion 10.7.4 from my external FW800 drive (for troubleshooting and housekeeping). So it looks as if the "boot problems" are not confined to Snow Leopard 10.6.8.
Interestingly, I can use this same external drive to boot my iMac (10.7.4) and my older MBP8,3 (10.8) into 10.7.4 - but not the newer MBP9,1.
The MBP9,1 with Lion and Mountain Lion is turning into a disaster when it comes to external booting. If I could, I'd demand a return and a refund. After bottle-feeding Lion for a year, 10.7.4 seems basically stable and can still boot into Snow Leopard and Lion from my external drives if needed. But now I see I have a worse problem: Crippled Hardware. I suspect this bug needs a firmware update - if it is fixable at all.

Mountain Lion Freezes From Sleep Mode

It seems like Mountain Lion is going into this "kernel" panic mode after I try to bring my computer back from sleep mode. That thing everyone a lot of people talking about where it locks up and you can't force quit anything or do anything except watch the spinning beach ball and move between open applications.
These
Model Name:          iMac
Model Identifier:          iMac11,1
Processor Name:          Intel Core i7
Processor Speed:          2.8 GHz
Number of Processors:          1
Total Number of Cores:          4
L2 Cache (per Core):          256 KB
L3 Cache:          8 MB
Memory:          8 GB
Processor Interconnect Speed:          4.8 GT/s
Boot ROM Version:          IM111.0034.B02
SMC Version (system):          1.54f36
Hardware UUID:          E1ECD31D-0FEF-5073-9ABE-F9BB5C19F503
For what its worth I have tried removing all peripherals and see if it does it and it still does it.   This behavior doesn't happen to me at all while using the machine normally, only when I am coming back from sleep mode.   When I upgraded it didn't list any incompatible software.    Also I am noting that after a few trys I can relaunch finder but the spinning beach ball remains.   I was thinking that it was something like Windows Explorer crashing but it seems lower level problem then that.   There is something hanging and it doesn't seem like an application.   Seems like something in the OS, well, obviously because this wasn't happening before I upgraded.   I am just going to shut my machine down after I am doing using it for now so I am not hard resetting it four times per day. Has anyone else seen this behavior?

Okay, it has been over 30 hours since my iMac has done this.    It doesn't have that problem where it sits and spins any more.   My workaround is to go into System Preferences, Energy Saver, and slide the Computer Sleep all the way to NEVER.   I still put my display to sleep same time though. And I also uncheck Put Hard Disks to Sleep When Possible.    That seems to have done the trick for me.    I have done nothing else to remedy this and my rig would freeze up on my three times per day so there you have it.    Hopefully they will fix whatever issue is plaguing the sleeping computers.   I know there are alot of them out there set that why by default.

Mountain Lion sending fans into overdrive?

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