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Helpful answers
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Jul 27, 2013 10:55 PM in response to christangoby Jan Hedlund,Hi christiango,
This means that the computer cannot find a valid system folder.
You could try to reset the PRAM in order to see whether that makes a difference:
http://support.apple.com/kb/ht1379
If resetting the PRAM does not change anything, you would have to start the PowerBook Duo from another disk (such as a Disk Tools floppy). This way one can check the contents (if any) of the internal hard disk. If necessary, one can try to repair the hard disk structure and update the hard disk driver software. It would also be possible to reformat the hard disk and install a new operating system.
Can the sound of a spinning hard disk be heard?
Since this model does not have a built-in floppy drive, do you have access to the external drive (or possibly a DuoDock)?
Jan
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Jul 27, 2013 11:00 PM in response to Jan Hedlundby Jan Hedlund,Addendum/correction
christango,
Sorry for the incorrect spelling of your name in my previous message.
Jan
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Jul 28, 2013 12:58 PM in response to christangoby dalstott,This PowerBook Duo 280/280c can operate with the following Mac OSs.
Original OS System 7.1 (PowerBook Duo Enabler v2.0) Maximum OS Mac OS 8.1 If you need Mac OS floppies here are some sources.
http://rescuemyclassicmac.com/index.html
http://www.info.apple.com/support/oldersoftwarelist.html
http://lowendmac.com/2013/classic-mac-os-downloads-and-updates/