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Hey mate
As Shane said, try a longer exposure. Put it on a fixed tripod (or your heq5 mount), and point it at the sky.
Use your widest field of view lens (eg: your 17-85 at approx 20mm), set it on auto focus and hold the shutter halfway and point it at a bright star until the focus lock beeps. Then change it to manual focus and don't touch it! If the star isn't bright enough to get autofocus lock, then you'll have to try manual focus and expirement until the star is sharp when you zoom in on it on the LCD.
Set the camera to manual (M). For starters, set the exposure to 15" (seconds), and the aperture to f/5.6. Set the ISO to 800. Leave white balance on auto.
Then press the shutter. In 15 seconds, you'll see many stars!
Once you get the feel for it, go to 30 seconds (if you're tracking with your HEQ5) or use bulb mode with a remote or cable release, and go for 1-2 minutes, depending on the accuracy of your tracking.
Good luck!
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