Are you running the latest available firmware (BIOS)? If not, my first suggestion would be for you to install the latest firmware. You can obtain it here: Download BIOS Update [WYLPT10H.86A].
According to the TPS, the BIOS is supposed to be able to boot without monitor, keyboard or mouse connected. It does not list any BIOS Setup parameters as being associated with this feature.
If, after installing the latest firmware, you find that this problem is still occurring, I know of two workarounds that should make it work. First, you could disable Legacy USB support (which causes the BIOS to not look for a USB keyboard during POST). Unfortunately, this will likely make it extremely difficult to get into BIOS Setup (Visual BIOS) in the future. Alternatively, you could enable Fast Boot support (which causes (amongst other things) the BIOS to ignore USB completely during POST). Unfortunately, this also makes it difficult to get into BIOS Setup (Visual BIOS), but this can be overcome by holding the power button for 3 seconds when powering on.
Hope this helps,
Thank you all very very much. I solved this problem by resetting my BIOS to default values and then upgrade to latest Firmware.
I also disabled legacy boot and all other USB related options.
Again, thanks to all of you.