Activity Monitor Won't Run

Hello SkyDiver_09 & welcome to discussions...

Try locating and deleting this preference/plist file:

~(yourUserName)/Library/Preferences/com.apple.ActivityMonitor.plist

I am having the same issue. I've tried the FirstAid feature with Disk Utility to repaired some permissions and have also attempted what K T suggested.

This issue doesn't seem to be too common. Any new suggestions?

Me, too! Since upgrading to SL & then immediately to 10.6.2 a couple days ago.

Well, it won't run - it didn't crash, it just hung on startup. I tried repairing permissions and, after finding this thread, removed the plist file suggested, but no luck. I just realized I should check the log (Console), and found it was putting out this, over and over again:

12/13/09 11:28:47 AM com.apple.launchd[1] (com.apple.ActivityMonitor[4828]) posix_spawn("/Applications/Utilities/Activity Monitor.app/Contents/MacOS/activitymonitord", ...): No such file or directory

And exiting, then retrying every 10 seconds.

I opened the Activity Monitor package to confirm that activitymonitord is there, but upon rereading the message I realized it's telling me Activity Monitor needs to be in the utilities folder - and I had moved it into a subdirectory (to declutter my Utilities folder). It always worked there in previous systems, but apparently SL's Activity Monitor has a hard-coded address built in.

I moved AM back to where Apple wants it and it immediately opened. Don't know if this helps anyone else, but I thought I'd put this out there in case it does . . .

(Yes, I know you "should" leave programs where Apple puts them and keep your files in your user folder, but I just like to do things my way whenever I can get away with it.)

Anne

I was about to delete ~(yourUserName)/Library/Preferences/com.apple.ActivityMonitor.plist as suggested. I then read your post about Activity Monitors' directory address being hard wired into Snow Leopard. During Tiger I had dragged the Icon from the Applications Folder to the Dock. After upgrading I attempted to run Activity Monitor from the Dock Icon and it refused to open. I scrapped the Activity Monitor Dock Icon to the Dustbin and tried starting Activity Monitor from the Utilities folder and it opened immediately. I then dragged the Icon to the Dock again -post SL- and opened it from the Dock Icon as well. This solved my problem.

Thanks avjudge - i deleted the plist thing then moved into utilities folder, worked first time.

Thanks a lot, your message saved my night.
I had the same crashing problem.
As soon as i moved Acitivity Monitor to Utilities folder, it worked.