Make sure that there are no floppy or CD/DVDs loaded in the drives as this will cause this problem.

Now go into the BIOS and check your settings...unless you are very familiar with Overclocking then the settings should be default...or default with a few minor adjustments such as make sure that the boot virus checker is turned off and that the boot order is set for HDD as first boot device....

Also while in the BIOS you can change the setting back to show the boot P.O.S.T. page...if you want.

If all that checks out then let it boot up then you must check your programs and applications to see if they are set to perform a check during boot...

Make sure that your system is clean from all malware/spyware and viruses