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    It's openfirmware's prompt, and has nothing to do with unix or linux. The hard drive in the system is probably dying, which would explain why it failed to boot but then booted OK when you power-cycled the machine. You should replace the drive ASAP. If it's SATA, you're in luck - SATA is still very much in use and there are many options to choose from, including SATA SSDs. If it's IDE, they pretty much disappeared from the mainstream market over a decade ago. If SCSI, it depends on what type - old-fashioned 50-pin SCSI is also dead and gone, replaced by SAS. Commented Oct 14 at 3:37
  • It happen with different drives Commented Oct 16 at 8:37
  • In that case, I'd suspect the cable(s), or maybe even the disk controller card/circuitry, possibly due to a dry solder joint on the motherboard or capacitor that has gone bad or some other age-related hardware fault. Or maybe the power supply. Intermittent problems like this are usually (but not always) related to hardware rather than software. Also try thoroughly cleaning all dust and grime from the MB and any expansion cards - a vacuum cleaner and an artist's paintbrush are useful for this. Your 9111-285 is 16-20 years old (sold from Oct 2005 to Jan 2009), and hardware doesn't last forever Commented Oct 16 at 9:28
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    you may find more & better help on retrocomputing.stackexchange.com Commented Oct 16 at 9:29