Alert – Previous fan failure. Press F1 to continue: Dell Dimension 4550

On booting a computer with a previous fan failure the computer always posts at the bios showing: “Alert Previous Fan Failure press F1 to continue.” its not very apparent how to remove this on start-up. To clear the message push f2 on startup to open setup utility scroll down to the bottom select System Event Log push enter, choose mark all entries as read and then push enter.