Having some trouble using my Acer 22" LCD with my 1.67GHz low-res Powerbook. It had always worked fine until I installed the Leopard graphics update, after which the LCD stop receiving a signal through the DVI connection. The OS will detect that a monitor is connected (blue screen) but it will not send a signal to the monitor. I read on the Apple discussion board that a lot of people with MBP's were having the same issue. Last night I reformatted the HD and went back to Tiger, updated to 10.4.11, and to my surprise the exact same problem persists. I know it's not an issue with the monitor itself, as my PC works fine with it. So any ideas? I REALLY need to start using my monitor again. Thanks!