If you reloaded your previous save and hit the gong again after inserting the play CD, it should have worked.
Did you install the
patch again after you re-installed the game? Saves made under the patched version will not load in the unpatched game. If that was the problem, installing the patch should fix it.
Some re-release versions of the game may already be updated to the latest 1.0034A version, as shown in the bottom right corner of the main menu, so would not need to be patched.