Out of 99.9% you can bypass or get rid of the splash screen by pressing the ESC key (I'd usually say 3 times within 1 second) and you should see the "actual" screen behind it.
The BIOS HOT KEY for dell systems is the F2 key
Another thing, unless it's SONY or any of those other brands where you have to do key combinations to get into BIOS, you can always try these following keys:
ESC, F1, F2, DEL, F10 (pressing all these keys sequently during bootup should get you into BIOS somehow)
hope this helps!