Thought I'd post this in case anyone else runs into the same problem... Thanks to all for your advice and suggestions. Working on the theory that the cable might be bad/wrong, I located a store near me specializing in Apple repairs (yay!) and stopped by to see if they might have a different kind of cable.
The guys at the store said I most probably have not a Macintosh monitor but a monitor that was designed to work only with the Apple IIGS. They said that the first color monitor designed to be used with a Macintosh II wasn't made until 1988, and I knew mine was dated 1987. They said that the weird double display was a symptom of the monitor not being able to properly read the Macintosh RGB signal. Once I got home and looked at it again, I could see that the design was very similar to the 1987 monochrome monitor that goes with my Apple IIe. Alas, I can't even use the IIgs monitor with the IIe as it has a different kind of connector and, according to the store guys, a different kind of video! They happened to have a 1992 13 inch RGB monitor lying around, so I bought that for $20 and have confirmed that it works perfectly with the cable I originally bought, with both computers. Problem solved. Darn... now I have to go out and find a IIGS so I can use the monitor I got from the thrift store. :-P Thanks again to all... Onward with the vintage mac museum! Sara -- Vintage Macs is sponsored by <http://lowendmac.com/> and... Small Dog Electronics http://www.smalldog.com | Enter To Win A | -- Canon PowerShot Digital Cameras start at $299 | Free iBook! | Support Low End Mac <http://lowendmac.com/lists/support.html> Vintage Macs list info: <http://lowendmac.com/lists/vintagemacs.shtml> The FAQ: <http://macfaq.org/> Send list messages to: <mailto:[EMAIL PROTECTED]> To unsubscribe, email: <mailto:[EMAIL PROTECTED]> For digest mode, email: <mailto:[EMAIL PROTECTED]> Subscription questions: <mailto:[EMAIL PROTECTED]> Archive: <http://www.mail-archive.com/vintage.macs%40mail.maclaunch.com/> Using a Mac? Free email & more at Applelinks! http://www.applelinks.com