No Audio When Booting OS X from External HD

Hi, I've got a guest whose has pro-tools and a variety of other software on her MacBook Pro which is running Tiger. She needs her software and files, but wants to run it on my iMac(which is running leopard) for its bigger screen size. To help her out, I started her MacBook Pro in target Disk Mode, connected it to the iMac and then told the iMac to boot from her MacBook Pro. All her software ran, her files where there, and the computer even saw her external midi devices; the only problem is that there is no sound at all. None of the programs from iTunes to ProTools will playback any audio, and there isn't even a speaker icon in the menu bar.
Does anybody know what went wrong, or of any ways to fix this?
mike

It's often problematic when you attempt to boot one model of Mac from the hard drive for a different model, since often the drivers required for the Mac you're attempting to boot aren't on the other Mac's drive. So your iMac probably isn't going to work correctly when booted from her MBP's drive; the MBP just won't have the necessary drivers for the iMac. If you want to give her use of your iMac's screen to run her MBP, the only option that's at all practical would be Screen Recycler.
BTW, this is the iTunes for Windows forum, so you'll not normally be very likely to get a quick and applicable answer here when asking a question about a Mac.
Message was edited by: Dave Sawyer

Similar Messages

TS2289 I updated iMovie and now why isn't there any audio when I import movies from my Sony camera?

I updated iMovie and now why isn't there any audio when I import movies from my Sony camera?

What version of iMovie?
What camera?

Boot into WDS from external PXE

Hi there,
in our Company (huge datacenter) we use ONE PXE-Bootmenu for ALL Servers (not managed by me) to boot into different deployment-systems (predominant Linux-Based deployments). Now we want to implement WDS (on Server 2012 R2) to boot into Windows-Deployment-Services.
Now I asked the Team which is managing the DHCP and PXE to add a new Option to the PXE-Bootmenu so we can boot into WDS. On that machine there is ONLY WDS-Service running.
What do they need to setup? Which file must be linked from the PXE-Menu? Which path? Do I have to make any additional settings on WDS?
When I search the web, I can only find infos how I can setup SYSLINUX on a Microsoft WDS, but not how to boot into WDS from an external PXE.
Please can someone help?
Regards
Miranda

I wasn't referring to the setup, but the menu. The menu and config files are the same regardless of what the host OS is. I posted it as a reference to how it is possible to boot WDS from PXELinux, but the specific example is where the WDS is on the same
server.
Chainloading is definately what is needed, but even that iPXE link is chainloading via HTTP (hence my Apache/IIS remark)... I do not know how you can PXE boot a WDS via HTTP.
Windows Server also has a WDSUTIL command that sends out a "browse" option with the PXE Boot request. The result ends up being you can press F11 or F9 instead of F12 and the client machine will search the network for PXE servers. This is how I
currently manage having multiple PXE servers. My default option is to press F12 to do a Legacy PXE boot to the main server, or use F11 if I want to boot to the Linux or UEFI server. See here for that example:
http://www.stephan-schwarz.net/?p=58
If Linux has a similar option, it could be used so you can choose a different PXE server. Otherwise, still have to research how to chainload to an external server, without using HTTP unless someone knows how to PXE boot WDS via HTTP.
EDIT: pxechn.c32 looks promising to add a menu option to chainload to another server:
http://www.syslinux.org/wiki/index.php/Pxechn.c32

Cannot boot Snow Leopard from external FireWire drive

I use a Western Digital My Passport Studio 500 GB external drive to back up my MacBook Pro with Time Machine. I had created a 30 GB Leopard boot partition with various utilities and tools; since the small drive goes wherever the laptop goes, I figured it might come in handy to be able to boot the computer in the event something went wrong with its internal 250 GB drive.
Over the weekend, I upgraded the external drive to Snow Leopard, and now it can no longer be used to boot the laptop. The symptoms are truly weird. Holding down the Option key while rebooting does not show the external drive unless I disconnect and reconnect the FireWire cable. The drive then shows up. I select it, and it appears to begin to boot, then it just sits on the gray screen with the little round thingie turning for a long time (five to ten minutes). Eventually, the system boots from its internal drive. This happens regardless of whether I'm connected by means of FireWire 400 or 800.
After spending a lot of time looking at the usual suspects (cables, permissions, PRAM, etc.) I reinstalled Sand Leopard (OK, 10.5) and lo and behold, the drive boots again (though for some reason I still have to go through the disconnect/reconnect routine). Clearly, something in the OS has changed with respect to the way booting from external drives is handled.
On the positive side, I have none of the symptoms described in other threads: Time Machine works flawlessly, and both the boot partition and the Time Machine partition appear on the Snow Leopard desktop every time I connect the drive.
Does anyone have the same issues? Does anyone know of a workaround?
Thanks,
Daniel

Hi,
Working from a MacBook Pro 2.4 (Santa Rosa) with 4gb ram, running OS 10.5.7-
(All external HDs are 7200 rpm)
Shortly after our fresh install of Snow Leopard onto a new but already tested External 1.5 Seagate Barracuda (with the most current firmware), in an OWC Mercury Elite enclosure-
We installed Snow Leopard smoothly to that external HD without any issues, and it booted up from that 1.5T external HD, and worked fine.
Then, still working from the MacBook Pro, I turned on and booted another external HD (a Newertech Guardian Maximus RAID running 10.4.11 via FW800, daisy chained to the 1.5T External with Snow Leopard newly installed.
Again that's MacBook Pro <FW800> Snowy external HD <FW800> 10.4.11 RAID (booted & working from the RAID).
But when I tried to bootup up Snow Leopard, after doing the work on the 10.4.11 RAID-
It would not boot up.
Though Snowy would appear as an available Start Up disk, each time it was selected as the Boot drive,
the Internal HD OS 10.5.7 booted instead.
I changed around the cables and tried repeatedly.
Same result, no Snowy boot.
Even after the OS 10.4.11 external RAID was power down, and disconnected.
After some looking around, I found this forum:
http://discussions.apple.com/thread.jspa?threadID=2136208&tstart=0
Got me thinking.
I tried the USB, and it booted !
I tried the FW400, and it booted !
And mysteriously, at this point- I tried the FW800, and it booted !
And then, the MBP boots seemed to reliably boot from that external, via FW800.
Bizarre.
Snow Cat needs to be taught originally how to find FW800 from the bottom up ?
Turns out, Snow Leopard doesn't like booting,
if the preceding boot was on the 10.4.11 RAID, and work was done with programs there.
So, once again, I repeated this process:
After working with programs on the 10.4.11 external HD,
the MBP would not boot the Snow Leopard external HD,
it defaulted to booting from the MBP internal HD OS 10.5 via FW800.
even though Snowy was selected for Start Up.
This was the case repeatedly.
(It would also boot from the 10.4.11 external RAID, if it were selected for Start Up.)
(In each of these tests below, I only rebooted the computer at each test. I did no work with programs on the various HDs.)
SO, once again, at this point of the process:
I plugged in that Snowy external HD via FW400,
and it booted up fine !
Then I booted up from the Internal 10.5, and tried to boot Snowy via FW800 again.
It worked !
Then I turned on the 10.4.11 RAID external HD, and tried to reboot from the Snowy external HD.
It worked too !
Then I booted from the 10.4.11 RAID, it came up fine.
Then booted from the Snowy, it came up fine.
Then booted from the Internal HD 10.5, it came up fine.
Then booted from Snowy again, it came up fine.
Then I turned off the 10.4.11 HD, booted from Snowy, it came up fine.
Then booted from the Internal, it came up fine.
Then tried Snowy one last time, it came up fine.
Anyway, the issue is:
It works fine-
Except when I do work within the programs on the 10.4.11 external RAID.
Then I have to use FW400 or USB to get it to boot once again . . .
Regardless of whether the other external HD is removed from the system.
It's some sort of flaw, and totally repeatable in testing.
Hopefully, it will be fixed soon.
Howard

Booting Powermac G5 from External Firewire.

I wish to be able to boot Leopard on an external FireWire portable drive on my Powermac G5 in case of hard disk failure.
Does anyone know which makes of portable drive support booting a PPC from Firewire, I have tried a Western Digital Studio for Mac but that does not show up when holding down the option key during startup.
I think the chipset on the WD drive is not compatible with the Mac.
Many Thanks...

Hello, WD makes great drives, but not great enclosures...
The WD My Books have had far less than glowing reviews for Macs...
http://discussions.apple.com/thread.jspa?threadID=1543028
http://discussions.apple.com/thread.jspa?threadID=2191614&tstart=0
http://x704.net/bbs/viewtopic.php?f=12&t=3219&p=42023&hilit=western+digital#p420 23
http://x704.net/bbs/viewtopic.php?f=6&t=2939&p=34120&hilit=western+digital#p3412 0
The following external hard drives are bootable on Intel-based Macintosh computers systems through USB:
• My Book Essential Edition
• My Book Essential Edition 2.0
• My Book Home Edition
• My Book Mirror Edition
• My Book Office Edition
• My Book Premium Edition
• My Book Premium Edition II
• My Book Premium ES Edition
• My Book Pro Edition
• My Book Pro Edition II
• My Book Studio Edition
• My Book Studio Edition II
• My Passport Studio
The following external hard drives are bootable on Intel-based Macintosh computers systems through FireWire (1394a/b):
• My Book Home Edition
• My Book Mirror Edition
• My Book Office Edition
• My Book Premium Edition
• My Book Premium Edition II
• My Book Pro Edition
• My Book Pro Edition II
• My Book Studio Edition
• My Book Studio Edition II
• My Passport Studio
The following external hard drives are bootable on Power PC based Macintosh computers systems through FireWire (1394a/b):
• WD My Book Premium Edition
• WD My Book Pro Edition
The following external hard drives are not bootable on Power PC based Macintosh computers systems through USB/FireWire 1394(a/b):
• My Book Essential Edition
• My Book Essential Edition 2.0
• My Book Home Edition
• My Book Mirror Edition
• My Book Office Edition
• My Book Premium Edition II
• My Book Pro Edition II
• My Book Studio Edition
• My Book Studio Edition II
• My Passport Studio
• My Passport Elite
• My Passport Essential
• WD Passport
• WD Passport (Silver)
That being said, Option Boot won't show until you Format it HFS+ & Install OSX on it, or clone the Internal.
How to format your disks...
http://www.kenstone.net/fcp_homepage/partitioning_tiger.html
Thanks to Pondini, Formatting, Partitioning, Verifying, and Repairing Disks...
http://Pondini.org/OSX/DU.html
As far as recommendations for a drive, the Quad Interface ones here...
http://eshop.macsales.com/shop/firewire/1394/USB/EliteAL/eSATA_FW800_FW400_USB

[Forum FAQ] Error 0xc0000428 when booting Windows 8 from Windows 7 BCD

Scenario
To better analyze this issue, I introduce my test environment firstly.
I have installed Windows 7 and Windows 8 in separate disks (Figure 1)
Disk1 (only one partition, C drive): storing BCD
Disk2 (only one partition, D drive): storing Win 7 system files
Disk3 (only one partition, E drive): storing Win 8 system files
Figure 1.
Then I performed the steps below to boot Windows 8:
Step 1: Boot the computer from Operation System installation media, then I formatted Disk1 to NTFS and activated it via Diskpart Command-Line Utility. You can use the commands
below in order to achieve that (Figure 2):
List volume
Select volume x
Format fs=ntfs quick
Active
Figure 2.
Step 2: I copied the boot files from Windows 7 disk via BCDboot command below:
Bcdboot d:\windows /s c:
Step 3: I edited the BCD file to add an entry for Windows 8 using the command below:
Bcdedit /store c:\boot\bcd /create /application osloader
Steps 4: Since the command above will create a GUID of a new boot object for Windows 8, we can use the following command to represent the GUID:
Bcdedit /store c:\boot\bcd /set {GUID} device partition=E:
Bcdedit /store c:\boot\bcd /set {GUID} osdevice partition=E:
Bcdedit /store c:\boot\bcd /set {GUID} description “win8”
Bcdedit /store c:\boot\bcd /set {GUID} path \windows\system32\winload.exe
Bcdedit /store c:\boot\bcd /set {GUID} systemroot \windows
Bcdedit /store c:\boot\bcd /displayorder {GUID} /addlast
Steps 5: I checked the BCD files by running bcdedit command. (Figure 3)
Figure 3.
Symptom
When I rebooted the computer and selected Windows 8 Operating System to boot, then I encountered the following error message (Figure 4):
File: \windows\system32\winload.exe
Status: 0xc0000428
Info: Windows cannot verify the digital signature for this file
Figure 4.
Cause
This issue is due to the bootmgr file, we cannot use the bootmgr file of Windows 7 to find the Windows 8 Operating System files.
Solution
According to my scenario, I just need to replace the bootmgr file with the bootmgr file residing in the root directory of Windows 8 Operating System.
If you want to replace it via the command prompt, it is necessary to un-hide the hidden file in the root directory of C and E drive before coping the file. You can use the
commands below to do that:
attrib c:\bootmgr -h -s
attrib e:\bootmgr -h -s
Copy e:\bootmgr c:\bootmgr /y
More information:
A Description of the Diskpart Command-Line Utility
http://support.microsoft.com/kb/300415
BCDboot Command-Line Options
http://technet.microsoft.com/en-au/library/hh824874.aspx
Please click to vote if the post helps you. This can be beneficial to other community members reading the thread.

Cause
This issue is due to the bootmgr file, we cannot use the bootmgr file of Windows 7 to find the Windows 8 Operating System files.
The Windows 7 bootmgr can indeed boot Windows 8.
This is on a BIOS system
https://www.youtube.com/watch?v=AVO5aeaKeeE
This is on a UEFI system
https://www.youtube.com/watch?v=g3-K6Fyobz0
The Windows 8 bootmgr partially loads Windows 8 before offering the boot menu. By choosing Windows 7, the system must do a reboot. Using the Windows 7 bootmgr, no reboot is required.
"Let them that don't want it have memories of not gettin' any." "Gratitude is riches and complaint is poverty and the worst I ever had was wonderful." Brother Dave Gardner. "Experience is what you get when you're looking for something
else." Sir Thomas Robert Deware

Can only get audio when trying to AirPlay from Dish app

Since updating to IOS 6 I only get audio when air playing from my Dish Network app on my iPad. I can get audio and video when mirroring; however the quality is horrible and it doesn't fill my screen. I was able to get audio and video both before updating my iPad and Apple TV. The recent updates have been a disaster!!
Apple TV and AirPlay were great products before. I thought updates are supposed to make Apple products better....not worse. Please help if there is a solution

Usually these types of limitations are added by the app developer, especially with media apps like these. However I would first try Resetting the devices. I found the best way to reset the iPad is to close all apps in the recently used app list. Double tap the Home button to reveal the list at the bottom then tap and hold one icon till they wiggle and display a minus button. Tap the to close all apps them press the Home button to get back to the home screen. Hold the Sleep button till "Slide to power off" appears. Once it has shut down completely press the Sleep button till you see the Apple icon.
The procedure is similar to resarting your computer when it starts acting flaky. iPads are just a hand head computer and rarely gets shut down or reset so it would be similar to running your computer for months at a time without shutting it down.

DRMK when booting to W7 from grub

Hi.
I've got myself a brand new Precision M4600 laptop, and decided to dual boot Archie and Windows 7. So I received the Precision with w7 installed, btw i've got a 256gb SSD which is partitioned as shown:
[ama@ama-precision ~]$ sudo fdisk -l
Disk /dev/sda: 256.1 GB, 256060514304 bytes
255 heads, 63 sectors/track, 31130 cylinders, total 500118192 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x4e92f42b
Device Boot Start End Blocks Id System
/dev/sda1 * 63 80324 40131 6 FAT16
/dev/sda2 81920 1622015 770048 7 HPFS/NTFS/exFAT
/dev/sda3 1622016 266729471 132553728 7 HPFS/NTFS/exFAT
/dev/sda4 266729472 500103449 116686989 5 Extended
/dev/sda5 266729535 275517026 4393746 83 Linux
/dev/sda6 275517090 324338561 24410736 83 Linux
/dev/sda7 324338625 500103449 87882412+ 83 Linux
I installed GRUB on the mbr, install goes fine, arch goes fine (posting this message from arch, met some issues though but nvm) but when i try to boot to w7 from grub, it shows:
Booting Windows 7
rootnoverify (hd0,0)
chainloader +1
Loading DRMK V8.00...
DRMK Version 8.00
COMMAND.COM Build 37 - Jul 20, 2008
DRMK KERNEL Build 15 - Aug 8, 2008
Copyright (c) 2006-2008 Dell Inc. All rights reserved.
C:\>
so wtf is this dell drmk thing ? Googling didn't help me that much...
Oh and here's my menu.lst
# Config file for GRUB - The GNU GRand Unified Bootloader
# /boot/grub/menu.lst
# DEVICE NAME CONVERSIONS
# Linux Grub
# /dev/fd0 (fd0)
# /dev/sda (hd0)
# /dev/sdb2 (hd1,1)
# /dev/sda3 (hd0,2)
# FRAMEBUFFER RESOLUTION SETTINGS
# +-------------------------------------------------+
# | 640x480 800x600 1024x768 1280x1024
# ----+--------------------------------------------
# 256 | 0x301=769 0x303=771 0x305=773 0x307=775
# 32K | 0x310=784 0x313=787 0x316=790 0x319=793
# 64K | 0x311=785 0x314=788 0x317=791 0x31A=794
# 16M | 0x312=786 0x315=789 0x318=792 0x31B=795
# +-------------------------------------------------+
# for more details and different resolutions see
# http://wiki.archlinux.org/index.php/GRUB#Framebuffer_Resolution
# general configuration:
timeout 5
default 0
color light-blue/black light-cyan/blue
# boot sections follow
# each is implicitly numbered from 0 in the order of appearance below
# TIP: If you want a 1024x768 framebuffer, add "vga=773" to your kernel line.
# (0) Arch Linux
title Arch Linux
root (hd0,5)
kernel /boot/vmlinuz26 root=/dev/sda6 ro
initrd /boot/kernel26.img
# (1) Arch Linux
title Arch Linux Fallback
root (hd0,5)
kernel /boot/vmlinuz26 root=/dev/sda6 ro
initrd /boot/kernel26-fallback.img
# (2) Windows
title Windows 7
rootnoverify (hd0,0)
#makeactive
chainloader +1
i've also tried uncommenting the makeactive line but no help.
thanks for your help.

rootnoverify (hd0,0) = /dev/sda1
rootnoverify (hd0,1) = /dev/sda2
see whitch one is your windows installed sda2 or sda3 and point that into /boot/grub/menu.lst
aka..
# (2) Windows
title Windows 7
rootnoverify (hd0,1)
#makeactive
chainloader +1
or
# (2) Windows
title Windows 7
rootnoverify (hd0,2)
#makeactive
chainloader +1

XSRF error when returning to SRM from external catalog

Hello,
We recently applied support package stack 19 to our SRM 5.0 development system, and after doing so found that some of our configured catalogs began producing an XSRF error when attempting to populate the SRM shopping cart with items from the catalog. The symptoms encountered are practically identical with those described in Note 1615697 ("Return to SRM application from Catalogs result in Dump"). This error did not occur prior to applying support packages.
In an effort to resolve the problem, we applied the following Notes that described the same or similar symptoms:
1551982: Cross Site Request Forgery Protection for stateless BSP
1596088: frequent dumps in ITS services
1607780: Update #5 to security note 1522651
1613427: ITS Services lead to XSRF Dumps
1615697: Return to SRM application from Catalogs result in Dump
1619323: Frequent Dump issue in ITS
1621525: Dump in Vendor list service
1629031: BBP_BACKGROUND_APPROVAL service results in dump
1632110: Quotation search help fields results in a Dump
1634612: Frequent Dump issue in ITS in Search screens
1650207: BBP_POC service results in XSRF dump
1658516: Applets sheitern an XSRF-Schutz (COOKIE_NOT_FOUND)
1675491: ITS: CALL BROWSER and termination of a session
This did result in some of our catalogs working that previously were dumping, but we are still having issues with at least two and possibly other catalogs. These are external vendor catalogs using the OCI interface.
The error occurs at the time of transmitting items from the catalog back into the SRM shopping cart. The catalog screen is replaced with an error screen with the messages "The URL https://<<our SRM dev system>>:/sap/bc/gui/sap/its/bbpsc03/ was not called due to an error" and "A:ITS_P:019 XSRF no sec_sesstoken". The shopping cart in the SRM system is lost after this error occurs. No short dump is recorded, but the SM21 system log records the ITS_P 019 error against tcode BBPSC03, program SAPLBBP_SC_UI_ITS.
Most of our catalogs, internal and external, are fine after applying the Notes. Just two external vendor catalogs still exhibit this error.
I experimented with adding a new parameter after the Return URL in the catalog configuration in SPRO with name = ~SAP_SESSTOKEN, value = `SAP_SESSTOKEN`, and type = SAP Field, based upon Note 1481392, but this did not make any change in the behavior.
I have patched the kernel (7.00) to pl335 (pl310 is delivered with sps19).
Anyone else having this sort of issue?
Best regards,
Matt

Hi,
What is the error/message you are getting?Please xplain in detail.
Also see these related threads for more pointers:
External Catalog gives HTTP 404 not found error on return
External catalog set-up
External Catalog integration with SAP
Re: OCI External Catalog and Shopping Cart Mapping
Help - Error while transferring item to shopping cart from external catalog
BR,
Disha.
DO reward points for useful answers.

No Audio When Listening To Streams From Websites

Hi, I'm having problems getting audio only when watching videos streamed from different websites. For instance, on the apple website, when I watch the'WWDC 2006' keynote video I am not getting any audio. I've tried playing other videos I have on my computer and the audio is fine. In addition, playing audio files on my computer is fine. Does anyone have any suggestions?
Kevin

hi BnB, try the following...
1. reboot. then try again.
2. open up Applications > Utilities > Audio MIDI Setup.
is the Audio Output setting higher than 44100.0 Hz?
if so, make it that and then quit this app. then try again.
3. (black magic voodoo solution that does sometimes work).
start GarageBand then quit it... then try again...
post back if none of these helped... cheers

XP crashes when booting everything apart from safe mode

My PC (with K7N-ILSR mobo) has been running fine for ages. Suddenly now it's crashing when booting - it crashes for everything apart from safe mode. it also crashes on safe mode with networking. i've tried disabling the onboard LAN, unplugging the cable, etc without success. any idea what i can do to fix it?

to dancing_bear,
try to resinstall the graphics card drivers in safe mode. this problem is likely due to corrupted graphics card drivers. if still fails, i suggest that u back up your data, then perform a reformat and reinstallation of the operating system.
if problem still persist after all these workarounds, then open up your pc chassics and observe all the cooling fans. make sure that are all working properly. (of course your pc has to be on) if any of the fan is not spining or spining very slowly, then its time to replace them. also not forgetting to check on the capacitors as well. they should not be bludging from the top or having brownish substances at the top or bottom of the capacitors. if you happen to see these, then send your motherboard for a recap.
cheers

I get no audio when running news videos from home page

I get no audio when running video on firefox but everything works correctly using explorer or opera

Hi coyote6014,
It could be a couple of things. You might have accidentally muted audio for Firefox. The article Knowledge Base article [[No sound in Firefox]] will show you how to check.
If that doesn't work, you should look at [[Video or audio does not play]]. This will show you how to troubleshoot any plugin/extension issues that might be impacting your system.
Hopefully this helps!

Issue when Calling the RFC from external system

Hi,
I have created one RFC, in which I am using one function module to get the material customer status.
Functional Module name is "QC01_BATCH_VALUES_READ".
When I run this in SAP, it is giving a value for Cusotmer Status. But when this RFC is called from .Net system it is not returning any value for this field.
Even I used a different function module 'CLAF_CLASSIFICATION_OF_OBJECTS' for the same, in this also in SAP it is doing good, but when it is called from .Net, the program is giving dump.
Please help me to resolve this issue
Thanks
Ravi

Hi Ravi,
Issue can be either in the .NET program or in the RFC destination creation.
1)
Check whether data types of .NET program which is calling the SAP function module are correct.
If there are issues with data types, program dont report if you dont so explicitly.
2) Check whether RFC destination you are giving in your .NET program is correctly configured in
SAP , verify by testing the same.
Apart from above two reasons, I dont see any other major reasons for not getting correct results.
Regards
Krishna

Error when boot for install from CDs

Hi.
I have Solaris10 distribution on CDs and when I boot from CD and check type of install, I get a error:
WARNING: consconfig: could not find driver for screen device /pci@0,0/pci8086,24,4e@1e/pci8086,1879@c
Can't find driver for console framebufferI have motherboard: Intel Server Board SE7520JR2
Somebody, please, help me with my trouble :((

Have you tried re-transferring them from the computer where they are mounting?
You might try this, too:
Repairing the Hard Drive and Permissions
Boot from your OS X Installer disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Installer menu (Utilities menu for Tiger, Leopard or Snow Leopard.) 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 installer. Now restart normally.
If DU reports errors it cannot fix, then you will need Disk Warrior and/or Tech Tool Pro to repair the drive. If you don't have either of them or if neither of them can fix the drive, then you will need to reformat the drive and reinstall OS X.

Can't boot snow leopard from external drive

I have a copy of snow leopard installed on a separate usb hard drive which I use to run some PowerPC programmes under rosetta. I can attach this USB drive to my Mac Pro and also to an Intel Macbook and choose to start up on this external drive without any issues. However when I try restarting my new 2011 iMac on this external usb drive the machine crashes every time with a kernal panic. Is this problem unique to me or does everyone else have this issue with new iMacs. Mine is a 27" 3.4ghz i& with 12ghb ram installed running 10.72. Is their soemthing I can do to resolve this problem?

I have now solved the problem of being able to boot from either Snow Leopard or Lion on a new Mid 2011 iMac. This is how I did it.
1. Attach an external USB drive to an earlier Mac or borrow one from a friend. In my case I used my 2009 Unibody Macbook (which has Lion installed on it but does allow you to install Snow Leopard on an attached device) Put the Snow Leopard install disc in this machine and tell it to install Snow Leopard on your attached USB Drive.
2. Start up the Macbook (or whatever machine you are using) and get it to restart on the attached USB drive so that it boots up in Snow Leopard. Then when Snow Leopard is up and running on the attached external drive, do a software update to bring it up to 10.68 (the current version). This step is important as I found that if I plugged in the external USB drive into the iMac with only operating system 10.6 installed it would cause a kernal panic on start up when I choose to start up on the external USB drive.
3. With Snow Leopard updated to system 10.68 you can now plug it into your iMac and restart the iMac booting into Snow Leopard from the external USB drive. You do this by either going to System Preferences>Startup disk and choosing the external drive, or by holding down the option key when you restart your Mac and choosing the external USB drive.
4. The next step is to make your iMac dual boot now that you know it can run Snow Leopard successfully from an external USB drive. To do this, go into Utilities>Disk Utility and select your main drive. Select the main disk (with Lion on it) and then choose Partition and choose 2 Partitions. Drag the first partition bundary line down to make the second partition size as small as possible. In my case I had a stock 1TB drive and the smallest partition size it would allow me was 70gb. Create the second partition (assuming you have spare space on your drive to allow this to happen). This will then create a second hard drive icon on your desktop. I renamed mine "Snow Leopard startup".
5. Download the free (and excellent) utility Carbon Copy Cloner and use it to copy your Snow Leopard operating sytem from your attached USB external drive to your new partition.
6. That's it! Now you can choose to start up your iMac from either Lion or Snow Leopard using either method mentioned in 3 above.
7. As a final step I suggest your install your Rosetta only programmes in your new Snow Leopard partition so that you can access them easily and keep them all together.

No Audio When Booting OS X from External HD

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