Re:
Hello,
ok i see. Strange, it's more common for you to get a display during POST (powering on) and no display during OS boot than the other way around.
What are your system specs? Maybe it POSTs so fast you don't get to see any diagnostics or anything during POST, and you literally see the OS boot screen first.
Try randomly pressing F1, F2 or DEL while powering on (they are the common BIOS access keys...).