Have you checked the flash mode?
I have no problems with the combination D300 SB-800.
I assume you don't have a picture if the flash goes off before the shutter open(?)
If you do check the menu e2 Flash shutter speed you can set it at a few seconds in spite of the fact that the flash sync (e1) is something reasonable like 1/250
The flash shutter speed is set to 1/60 in my camera...
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