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Regardless of compatibility, the site is doing this illegally. Adobe does not allow it's software to be sold used nor does it let it's codes be sold. Buying from these guys will put you in a position of possibly being sued by Adobe. Given that, CS4 upgrade will only upgrade from CS3 and CS2. My suggestion is that you contact Adobe and see if they can offer you a solution more in keeping with legalities. They may accept a written request with inclusion of your original purchase invoice or they may allow you to trade the upgrade for the full package for the difference between the two. It's your call.
It is possible you have a power supply failure. My MDD was doing the same thing unless I reset the PMU. There is a tutorial here on checking the PS - D275729F-09DA-4FBB-96B3-BEEEB2C04619.html It for a MDD, but I would think it would be useful for your situation. Do you have an Intuos tablet connected? The drivers for that might be causing the problem and should be updated to the newest driver available
On the left Top of your monitor is a apple Logo.Tip on it and select "About that Mac"
A Window pops up and you select "More Info"
it shows you the OSX on it. OSX 10.3 or OSX 10.4
Google "Safari Browser for OSX 10.? "
Download it and it will work.
You may have the latest Version.