I have a couple of beige G3's and they are VERY finicky about booting into OSX from OS9. Your best bet is to download XPostFacto and use that to select your boot partition. It's free, and there are lots of links here on ehMac. Do a search.
Although the beige G3 is supposed to be supported in Jaguar, it's not always easy to get it going without some help. XPostFacto should do the trick.
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