Hi David, did you ever figure out the problem here? I just bought two NEC Multisyncs as well, and have verified that they both work fine on my A1200.
However, when I use them on my A1000 I get a similar result: The screen initially comes on, but after loading a little of the kickstart everything stops. I'm using a floppy emulator, so I can see that it loads to about track 24 and then hangs; If I switch to Workbench or any other disk image, the Amiga doesn't even try to access it after a soft reboot.
I have only tried a little troubleshooting, I plugged my TV into the A1000 at the same time (the LCD monitor is on the 23-pin, the TV is on the A/V pin and is what I have been using with this computer for over a year)
With both plugged in from cold-boot, I see the initial white/gray screen, then the LCD cuts out, and the TV's screen turns black with two thin lines in the middle: a red and a green
I *have* found that if I leave the 23-pin cable unplugged, load Kickstart and Workbench, the computer works just fine (as it always had since I bought it), then once that's finished I can plug the LCD monitor in and everything seems to be fine. This does not sound like a good solution, and I can only imagine something must be going wrong internally.
Anyway, hope this extra info helps anyone solve the problem.
