Motherboard issue. how to conclude that my motherboard is free of errors. when i switch on my

Question

how to conclude that my motherboard is free of errors. when i switch on my system it gets started and a display comes something like "press any key to boot from cd" if i does the same, system hangs and nothing happens. please help me out with the problem and try to figure out whether the problem is with hard disk, ram or motherboard. thanks prabha