I am glad to hear that some people have had good experience with those refurb. mobos from overstock.com. Honestly, overstock.com has been very good to me, and their customer service is better than most online stores.
pstar, you might have obtained an older revision of your mobo than the other person, or maybe your bios needs to be updated ,(if your bios is before 10/99 there is no chance your system will boot with a coppermine chip; most bios that will run with celeron II's are around 4/00). Finally, make sure your slocket is compatible with coppermine chips; being able to use a celeron 300A on this slocket certainly does not guarantee that you'll be able to use a celeron II on it. You need to be able to manually set the FSB to 66/100 (try 66 first), and you need to make sure that this slocket will not automatically supply 2.0V when running at 66 (for older celerons). Good luck! Remember, don't bother to overclock your chip if you can't even run it at default speed!