I thought I'd post this here to perhaps help some.
I have a Classic II which worked OK, but with only a faint sound. So I thought I'd recap, but only those caps I guessed were involved in sound.
Started with C11, C12, C14 and C15: no help
Then C9: no help
After I changed C4 (47uF), I finally got a loud bong. However, I lost the mouse pointer
Thinking I must have shot C5 and C8 while hot-airing that area to desolder, I changed them too, and I recovered the mouse pointer
So everything looked fine, except for a heavy random hissing/whistling of t