I cannot open ANY .dmg files "disk image failed to mount"

I

irisheyes

Registered
Hi everyone I've searched through the site and have already tried any advice I found - as detailed below. None of the existing solutions have worked for me, so I'm appealing for your help.

I'm using a 2GHz PowerPC G5, OS X 10.4.11, with 1 GB on one dimm

I cannot open ANY .dmg files. I have tried clicking the image, and also on a clean download used "open with" each time I received the following message

The following disk image failed to mount
Reason: Device not configured


I have followed the instructions in this thread:- http://macosx.com/forums/mac-os-x-s...image-failed-mount-device-not-configured.html

Firstly
Run /Applications/Utilities/Disk Utility.
Click on “Macintosh HD” in the left column and then press the “Repair Disk Permissions” button.
Delete the file called /System/Library/Extension.kextcache
Delete the folder called /System/Library/Caches/com.apple.kernalcaches/
Restart

That made no difference.

I then tried bobw's advice here http://macosx.com/forums/mac-os-x-s...752-panther-disk-image-mounting-failed-2.html Panther - Disk Image "mounting Failed"

That made no difference.

I have since gone on to justanswer.com and the advice I received was to do an archive and install and then a full combo update. Before I do that I want to check is that the best possible solution is there anything else I can try?

Any advice would be welcome and I'm not a techie, so simple language would be most appreciated. Many thanks in advance.
 
Any advice on this before I do an archive and install?

Also, having decided to try to open a .dmg file one more time, I've just searched for diskimagemounter.app on my computer and can't find it? Could this be the problem? How could I have "lost" it? And, more importantly, how can I find it?
 
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