That would be the air being let into the CRT as the glass was cracked, sadly. I wouldn't power that machine up again until you replace the CRT.

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aww, the hiss of death...heard it, a few times, over the last several years..

not that hard to replace the CRT....too bad, you're not near by, I have a bunch of good used tubes, with nary a burn-in..

on some compact macs, they were cursed with severe screen ins

before the era of after dark. . . . .... . . . . . . . . . . . . . ...... . . . .... ...