What exactly does your Mac do? Some troubleshooting information:
Try setting up another admin user account to see if the same problem continues. If Back-to-My Mac is selected in System Preferences, the Guest account will not work.
If the problem is still there, try booting into the Safe Mode. Shut down the computer and then power it back up. Immediately after hearing the startup chime, hold down the shift key and continue to hold it until the gray Apple icon and a progress bar appear. The boot up is significantly slower than normal.
Thanks for your input Linc, but I thought I described the problem and wasn't trying to make a conclusion. The computer freezes randomly. I had gotten some advice that running Drive Genius might find why it is freezing and fix it. I just wanted to find out if it was compatible with Mountain Lion. Now that you have enlightened me as to it's capabilities, I will try another approach.
Good advice from ER.. also it would be worth double checking if you have updated any major Apps or the Apple OS to 10.8.2 during the timescale concerned.. since this might cause one or more incompatibilities (this can lead to freezing).. Manufaturers' websites should list any known issues.
Utilitiy software such as Drive Genius, Disk Warrior, Tech Tool Pro, etc are best kept specifically for data recovery ( they must be kept up to date and may lag behind the current Apple OS by a noticable margin) but in many cases they are now priced almost the same as an external hard drive, so backing up with Time Machine is more cost effective than ever.. as a safety precaution always back up your data, before troubleshooting.
/dance with Modinator
I was comtemplateing upgrading to Mountain Lion and then my machine started freezing. So I upgraded to ML and still had the same issue. I tried the safe boot and creating another user account. Then I discovered that there were some unwanted items in my login items. I was told by someone that those could be deposited there by malware. So I deleted them and it has been working OK, so far....
I'll let you guys know if I have any trouble going forward.
Thanks for the assistance by all!
No worries PG, glad you got a solution to the problem.
For future reference, it is worth bearing in mind that loading a new OS onto a Mac with problems can make it worse, rather than better.. always make sure you have all the updates prior to a new OS.. its also worth doing the Fix Permissions 'spring clean' before loading a new OS.. and make sure you have safely backed up your data.
Although it is possible for Macs to be directly affected by malware, it is currently quite rare..when you load Apps onto your Mac, the install procedure may automatically put shortcut links into the Dock and/or into Login items.. out of date links in Login Items can cause your Mac to be noticably slow to complete the Boot cycle (and other issues).. as would automatic links to shared folders on a network or an external drive you no longer use.
So the person you consulted was correct to mention it is worth checking what is in Login items, from time to time (remembering that some items may be meant to be there, if they relate to Apps you still use).