The display on our iMac 9,1 (vintage 2009) (OS 10.9.5 or so) went black. At boot I hear no chime, but I see a brief 1 cm horizontal illuminated band then just more black screen. I can boot it into target disk mode. Having done that, I connected it to a MacBook Pro running the same OS and ran disk repair on it, which said it was successful. Also, I can boot it from the target disk (which is inside the iMac with the black screen). It will not boot to single user mode (except with a black screen, if at all). It will not boot to the recovery partition (except with a black screen, if at all). This makes me think the graphics card, the display, or whatever connects the two, or multiple items in that set are toast. I think the graphics card is soldered to the main logic board in this model. This makes me think I need a very expensive repair or a new machine. Do you agree? Anything else I should try before reaching for my wallet?