How long have you waited after switching the Amiga on with this CF adapter installed? The Amiga may take 30 seconds or more to detect the IDE drive, in which time it will output nothing but a blank screen and appear to hang for a while. This won't happen once the CF card is formatted, but it happens whenever an unformatted IDE device is attached. If there is disk activity, but still a blank screen, then this probably isn't the problem and it could be more serious.