In my opinion, if the machine boots (you see disk activity as per normal boot) but the screen stays blank at all times then there is usually something wrong in the output side of the video card, or the cable.
If you used the same cable when connecting to other machines, we can rule out the cable.
There's not much you can do if the Boot screen isn't shown other than to borrow or buy a video card, boot into Safe Mode (if you see the screen) and deal with the drivers at that stage for the new card.
If it still doesn't work, then there's a fault not detected in POST with your motherboard, IMHO.
Keep us informed.
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Posting Virtuoso
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since Aug 2007