Get hold of a copy of OS 9.2, Boot computer from that disk and then run the drive setup program in the utilities folder on the OS 9.2 CD. Failing that, u may need a new drive which if u have a imac G3 or powermac G3 beige desktop, this proceadure is easy.
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9.2 is a bit too new/bloated to run well on the 1400. I used one at work that I purchased new in '96, and they originally shipped with System 7.x. I upgraded it to 8.1 then 8.6; I tried 9.1, but even with the RAM maxed out on it (max is 64MB!) there wasn't much room for apps to run on it. I went back to 8.6, and that worked really well on that machine.
Here's an article on LowEndMac that talks about the best OS to use on a given system; his advice meshes nicely with mine!http://lowendmac.com/ed/moore/08cwm/best-o...-powerbook.html
Also, the LEM site has a swap list that you can join; there is a lot of activity on that list, and I see OS installer disks up for sale there regularly, usually for much less than other sites.
I believe Apple still has System 7 available for free download on their support site. You'd have to dig around a bit for that.