No post screen display.

Hi can someone please help me what went wrong with this problem. Normally when I start my computer I could see the 'post screen' where it shows the detected hdd and so forth. Lately it seem it is not showing, it will start to the 'welcome' screen. There is no problem whatsoever I could do my work normally only the missing post screen display. My OS. XP Pro SP2. Thanks.

 

Thanks for your speedy reply. The reason is I am thinking something wrong with my computer, as it normally show the post screen and could hear the beep when I start my computer. I could see whether the hdd and my cdrom and others are detected during startup. Since you said it is good I am quite satisfied that I am not infected with any spyware or virus where it disable the start up post screen. Could you please let me know how to set it back so I could see the post screen display. Thanks.