While in TV mode on the 20D

I was just trying to take some pics of a big fountain, and my flash won't fire at a faster shutter speed....I wanted to set it at 800 and it took the pic, but its too dark. How do I get the flash to fire at that high of a setting? Also, it flashed FINE when the shutter speed was at 250. THANKS!

Im NEW to digital SLR, and Im trying to work my way to full manual.

The 20D has a flash sync max at 1/250. If you want a higher flash shutter sync, you must use an external flash with high-speed flash sync (you must turn on the high flash sync mode in the external flash--see the flash manual).

Ok. I need to purchase an external flash. I just got my camera on Monday. That will be my next item.

Thanks for responding.

Have you tried lowering the ISO and shooting 250th of a second, Is this not fast enough to freeze the water? Even though the shutter isnt as fast the flash exposure should pretty much freeze the movement in P or manual mode.