1-8AcerAltos 21000 System Guide1.4 Power-on ProblemsIf the system does not boot after you have applied power, check thefollowing factors that might have caused the boot failure.The pointing symbol ( * ) indicates a possible cause of the problem.The check mark ( 4 ) tells you how to correct the problem.* The external power cable may be loosely connected.4 Check the power cable connection from the power source to thepower socket on the rear panel. Make sure that each cable isproperly connected to each power supply.* No power comes from the grounded power outlet.4 Have an electrician check your power outlet.* Loose or improperly connected internal power cables.4 Refer to section 2.5.1 for the cable connections and check theinternal cable connections. If you are not confident to performthis step, ask a qualified technician to help you.Make sure all power cords are disconnectedfrom the electrical outlet before performing thistask.If you have gone through the preceding actionsand the system still fails to boot, ask your dealeror a qualified technician for assistance.