Hi!
We received a used computer from an insurance company and was told it works well. However, when we booted up, we receive the following message:
                    Disk I/O error, replace disk, and press enter.

The computer is a Gateway, P5-133.  The individual who gave it to us did not know what O/S was running.

What is the meaning of this error?  How can we get it operating again?

Maureen

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