Daniel - If you look at the Windows 7 FAQ from Apple, there are some bluetooth issues that might be causing the black screen for two iMac models.
Once you have exhausted all the mac articles and are certain you have all the correct software, you might need to ask on a forum with more windows installer specific knowledge.
In general - if you get the installer running, then the Mac side of BootCamp is working. I'm not a big user of the windows sites at SE - so you might flag this for a moderator to transfer this to another associated site where more people have experience with troubleshooting the windows 7 installer process.
You might also cross post on whatever other site is best and link back here since you might actually need answers from both areas of expertise to solve your specific issue.
Best of luck!