HT1752 I have a black screen and I hear 6 hissing sounds durring start-up on my mac

I have a black screen and I hear 6 hissing sounds durring start-up on my mac, I have an old 1999 (possibly G5 PPC)Imac computer

Blank (lighted, but black) screen with cursor at bootup
[SOLVED] - Macbook Air Sleep/Wake problem
Dark screen on start-up can only see curser

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