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Assuming the sound on your laptop is functional you should be able to reset the volume level and thereby restore the chime sound by resetting the PRAM. But no, the two issues should not be related.
I've seen an iBook here and there show less RAM than it should actually have, so it's conceivable that a bad 1.42GHZ could be showing 256MB. It's hard to say whether that indicates bad RAM or not, but it probably does. A good test would be to add additional RAM and see if it registers correctly.
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Go under the Apple in the upper left hand corner to "about this Mac". First see if it is a Apple iBook G4/1.33 14-Inch (Late 2004). That machine has 256mb of onboard RAM.
RAM Type: PC2100 DDR SDRAM Min. RAM Speed: 266 MHz
Details: Supports a single 200-pin PC2100 DDR SDRAM SO-DIMM memory module.
Standard RAM: 256 MB Maximum RAM: 1.25 GB
Details: The maximum memory capacity of this system is 1.25 GB with 256 MB onboard and a 1.0 GB SO-DIMM.
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