.dmg files open disk utility. Can't install new software

For the last few months I've not been able to download and launch disk images (.dmg files). Instead of a dialogue asking if I want to launch the downloaded file or some other natural step in launching the disk image, I hear the hard drive boot as if I'm restarting the computer, and disk utility opens.
Disk utility sees the image and its path clearly, but shows the status as "Not Mounted." When I control click on the .dmg file, disk utility is the only app shown to open it, and in the main applications directory there is no obvious choice to mount the disk image.
This has happened twice when apple service folks ask me to download their app to view my desktop actions, and after some frustration they just give up and talk me through solutions the old fashioned way. One of them mentioned that I might be missing a certain script, but neither was willing when asked to help me solve the problem. Another asked that I try opening it with Safari (?) but like many apps it was greyed-out when I access the applications directory as mentioned above.
I'm running 10.5.8. Thanks for any tried and true solutions as I'm now not able to download and install various software (the latest upgrade of Skype for example) and this is clearly a critical problem.
Thanks,
Joseph

I just solved this myself, having clicked on a related "More Like This" link after I posted...
After double clicking the .dmg file in my download directory and automatically launching Disk Utility, I selected the .dmg disk image in the left-hand column. I then clicked over to the "Restore" tab in the top-center of the Disk Utility panel.
In the upper row of control buttons, I clicked the "Open" icon. This was not an obvious choice because it is small and "Open" is not the function I was seeking. If you roll-over that icon it says it is for mounting or unmounting a disk.
The disk image then mounted on the first try AND once it was mounted the "Open" icon name suddenly changed (greyed-out) to read: "Mount." A bit of an odd and elusive process but much easier than other more invasive procedures (like "repairing permissions") to recreate that auto-mounting capability I had lost...

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Hi, i have question about my macBook pro. I have a somehow managed to delete a driver or no, so I can not install new software updates. I have tried for several hours to fixe it on OS X tools-Disc Tools. anyone has a clue about this more than I have.

I have a somehow managed to delete a driver or no, so I can not install new software updates. I have tried for several hours to fixe it on OS X tools-Disc Tools. anyone has a clue about this more than I have about Mac´crack that **** formatted and has really nothing to the HD. what do I do??
<Edited by Host>

Cami87,
which model MacBook Pro do you have, and which version of OS X is installed on it?

I can't install new software update!

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How **bleep**.

Impossible to say without more details other than "I can't install". If you'll post full details, including whether you're attempting to update from the iPad directly or from iTunes on a computer, where things are breaking down, what error messages if any you're getting, and any other details pertinent to your issue, then someone can perhaps offer suggestions.
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I can no longer make dmg files in disk utility since upgrading to Mountain Lion

Hi everyone,
I'm a videographer, and have been using the facility in disk utility to make dmg backups of my media cards. It's proved to be a neat and tidy way of doing things, and is my equivalent to storing videotapes.
However, I no longer can make them.
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Maybe just corrupted Disk Utility preferences ...
Open the Finder. From the Finder menu bar click Go > Go to Folder
Type or copy paste the following:
~/Library/Preferences/com.apple.DiskUtility.plist
Click Go then move the com.apple.DiskUtility.plist file to the Trash.
Restart your Mac then try creating a .dmg file.

My Mac won't open certain files anymore so I can't install new programs.

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Hi VoxPariah, and a warm welcome to the forums!
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Reset Launch Services...
http://www.thexlab.com/faqs/resetlaunchservices.html
http://www.macosxhints.com/article.php?story=20031215144430486

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Never mind. Found this thread, did what it said, and it all works fine now.
https://discussions.apple.com/thread/5039921

Can't install new software PLEASE HELP!!!

I recently had a need to reinstall the original 10.2.1 on my ibook g3. Since this time, i have been unable to install osx updates, or reinstall the original 10.2.1 software (after the first reinstall, that is) As well I cannot install other programs. I have used disk utility and everything seems to check out in first aid (permissions, etc.). I had been using 10.2.8 before the first reinstall.
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Welcome To Discussions Bregan8r!
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-How much RAM is installed, and is it original or added?
-You have run Repair Permissions, but have you also run Repair Disk?
-Do you have a complete backup of your system, or at least any data that you couldn't bear to lose?
ali b

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Can't Install New Software

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Clean Install of Snow Leopard
Be sure to make a backup first because the following procedure will erase
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MB pro shuts off after bootup chime, hd damaged/volumeheader related - disk utility can't repair - how do i recover/backup my files??

Hi guys,
My macbook pro late(dec) 2011, doesn't boot up anymore, it just turns off after the chime (whilst a gray bar is loading a bit and then the MB shuts off)...
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Step 4(a) open Disk Utility from Utilities on the menu bar, then proceed to highlight the external drive in the left sidebar as you say and choosing Partition from the row of buttons that appear top center in the main window of DU.
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Error disk utility can't repair this disk...disk and restore your backed-up files

I have been working on a project using an external hard disk. I used my Macbook Pro (2010) to create this project and files (about 31 GB). Now I am trying to open the disk on my iMac (2014) and it doesn't show up. I can see the HDD when I use disk utility but get this message when I try to repair/restore the disc:
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Nico,
Did you find a way?
This just happened to me too.
https://discussions.apple.com/thread/5981446
-John

Can I fix a disk with this message?-Disk Utility can't repair this disk. Back up as many of your files as possible, reformat the disk, and restore your backed-up files.

Can I fix a disk with this message?
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Some problems can indeed be fixed this way. But working from Recovery_HD or Disk Warrior DVDs and working in the restricted environment those provide can be difficult. You can literally spend days working on this problem (while your regular work is unavailable) only to discover the old drive is unsalvageable.
There is no way to know up front whether you are facing a major Hardware failure or a minor software glitch, or something in between. Often you are forced to work from the drive you no longer trust. I continue to recommend you do this work from a different, fully functioning Mac OS X booted from a different drive.
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If the old drive eventually provides some needed data, and is salvageable, Merry Christmas.

My computer is shutting down before fully booting up. I am running the disk utilities program and have this message: Error: Disk Utility can't repair this disk . . . disk, and restore your backed-up files. Can anyone suggest what I should do next?

My computer is shutting down before fully booting up. I am running the disk utilities program and have this message: Error: Disk Utility can't repair this disk . . . disk, and restore your backed-up files. Can anyone suggest what I should do next?

So, you can't Install OSX to the external?
Or you can't boot from it when you do?
You're not the only one wondering... I'm reminded of the Goose that laid the Golden Egg story.

.dmg files open disk utility. Can't install new software

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