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They do that when the main CPU and/or code EPROM is missing or bad. A (working) sound CPU, however, makes the random sound on its own at power-up. Check to make sure you aren't missing some EPROMs (exactly which ones should be there depends on the game), and that the code is good.
Also, the game may or may not have suffered from the "suicide battery." You can read more about affected games, and fixes, on this page: http://www.arcadecollecting.com/dead/dead.html