I've been flying mostly FSX for quite some time, however I still breakout FS9 now and then. Primarily, because it's the only simulator with a good 737NG right now. I bought FS2Crew for the iFly 737NG yesterday and was going to go fly the NG and try it out. I started up FS9 and setup the FSUIPC controls. I also noticed that for whatever reason my FSDT KORD wasn't showing up (set to be my origin airport), so I quite and reinstalled. I also opened AES to make sure it was active and then went to start FS9. However, after showing the splash screen, the screen went black for about 3 seconds and then quite to the desktop. I've tried rolling back scenery.cfgs, deleting FS9.cfg (to force a rebuild), and restarting. All to no effect. As you can see, I have little to go on here. I get no error messages or anything other than a black screen and then CTD. Anyone have suggestions?

Try starting FS9 with only the default scenery (no addons at all). It is most likely some 3rd part file that is causing the problem. I once had a similar problem that I tracked down to a 3rd party library file (for RWY12 I think).

Delete the default flight and set up a new one.Go to yourdrive:\My Documents\Flight Simulator Files and back up the default, then delete itand see if it starts then.