Under the drive tray, there is a thin, ribbon cable that runs from the power supply to the motherboard. If you take a flathead (standard) screwdriver and gently, GENTLY, push down on it, does the unit come out of stuck on the black screen? These units are getting old and this is becoming a very common occurence. What you should do is power off the unit, take all drives out and then power on the unit and do this method first. If you can remove any pressure off of the cable and it stays on welcome, powering up, you should be good to go. Then, install the drive again and see if it will work. If it does, then you should get some hot glue and slowly glue the cable in place, so it doesn't move.
Give that a try and let us know if that helps.
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