FUJITSU DESKPOWER 6000 - Manual (Page 80)

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Error Message
Invalid system disk
Non-System disk or disk error
Operating system not found
Description and necessary action
Replace the disk, and the disk, and then press any key
This message is displayed if the computer is turned on
with a floppy disk other than a system disk set on the
floppy disk drive. Remove the floppy disk and press
any key.
Replace and press any key when ready.
This message is displayed if the computer is turned on
with a floppy disk other than a system disk set on the
floppy disk drive. Remove the floppy disk and press
any key.
The OS was not found. Confirm that the correct drive
is set by the BIOS setup utility or that the OS is
installed on the specified drive.