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It is possible the exposure set for the camera is not enough for the star you are guiding on. I had this experience for a while when I finally decided to learn how to use PHD to the fullest. I don't use QHY but instead a webcam and the performance of the QHY should way outperform the webcam.
The process I use to increase the slider (exposure Control) to the left or max. take a dark. If I see a star easily when selected great. If not I increase the time up increments till I see one. You have to take a dark shot every-time you change a setting.
If anyone has an alternative, I will be happy to know as well as I have only used PHD for a short time.
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