Which solder joints had bad cracking? Was this on the analog board?

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Yes, it was the 4 joints on the analog board.  Basically all I had to do was open up the computer, take off that white cover on the AB then inspect the back of the board's solder joints w/ a magnifying glass.  I found quite a bit of bad joints on that board actually and resoldered all the ones that looked cracked.  The 4 joints that go to the CRT were badly cracked, in fact one or two of them had a perfect crack that went the entire diameter of the joint... once I saw that I knew that this had to be causing trouble.  I tried to get as much of the old solder off as I could, but once i added the new solder the old seemed to melt together w/ the new and made a good clean joint.  My monitor is perfect now, no more wavy/jitteryness when its accessing the hard drive like previously.