Apple Macintosh Performa 570 series - Manual (Page 17)

9 Getting Started
Problems turning your computer on?
If the screen is dark, check these items to see if you can identify the
problem:
m Is the computer turned on? The power-on light on the front of the
computer should be on. Make sure the top of the power switch on the
back of the computer is pressed in.
m Is the power cord connected to the computer, and is the cord plugged
into a power source?
m If the computer is plugged into a power strip, is the power strip
turned on?
m Are the keyboard and mouse cables connected correctly? (Don’t
disconnect the keyboard or mouse cable while the computer is on.
You could damage your equipment.)
m Is the brightness control on the monitor (marked with the ¤ icon)
turned down?
m If you have an external hard disk attached to your computer, is that
hard disk turned on? Was it turned on before you turned on the
computer? If you’re not sure, turn everything off. Then turn on the
external hard disk before you turn on your computer.
If you see a blinking question mark on the screen, you probably need to
install system software. See “Installing or Reinstalling System
Software” in Chapter 5.