Yeah that's the expected behaviour. The longer beep tells you your CMOS has been cleared and your bios reset to default.
The absence of signal is very probably linked to the fact it's sending said signal through the IGFX to the VGA (D-SUB?) socket. I have the original version of the D1800 which doesn't have IGFX so I didn't have that problem. You might have to source an adaptor plug of some sort...
Thanks for the confirmation... I went rooting around in my computer parts junk pile and found a VGA cable and a DVI to VGA adapter; I was all excited there for a minute until I realized that was DVI
out...
EDIT - my D1800 (6 GPU) has the v2.00 sticker on it as well.