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Hi David
I am going to make some asumptions here, there is no mention of the type of mount, whether it is polar aligned or whether it is capable of being autoguided.
I have never used a C90 but it has a Flip Mirror type back, does it not.....
Not having a go at you as a lot of us have done this, have you flipped the mirror so light is getting to the QHY5........
A 90mm scope should show plenty of stars with the 1 second default setting, when you say you are only getting 1 or 2 per exposure and get worse when you do a Dark Frame are sysptoms of light not getting to the camera.
When I use a DSLR camera, I use an 80mm f/7 scope and have no problems getting plenty of stars with a Q-Guider, almost identical to your QHY5.
Have you tried to Calibrate, what happens, do you get Calibration Failed.
Couple of setting I use in 'The Brain' Aggressiveness - 80%, Calibration - 800ms, remainder, Default, my exposure is anything between 1.5 and 3 seconds, depending on conditions.
Try also aiming the scope at a fairly bright star, the 3 belt stars in Orion are a good choice, take a 1 second shot and focus in on that, see what it records, should be nice and bright, take a Dark and a lot more stars should appear.
Cheers
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