Sounds like the barrel rectifier at position CR5 on the analog board is going bad. Tech book I have here says its a MR824 rectifier. I had to look up the position and the part number in a book I have (Dead Mac Scrolls), but I have done this repair on a few Mac Pluses (same analog board as the 128 and 512), and they had similar symptoms. They had the Chirping noise, as well as the right side of the screen would move in and out (which would appear that everything is shifted left like you describe). Notes from the book. Original rectifier is a GI854, R-SI, 600V, 3A... and they recommend replacing it with a MR824, R-SI, 400V, 5A to avoid having the problem come back. The rectifier is kind of top center of the analog board. The analog board from those Macs was notoriously flaky. Lots of under rated parts that burned out easily. Probably Apple worst power supplies. Ironically, the 2nd worst are the CRT iMacs that brought back that same style computer. And ironically, the iMacs are bad for the same reason, under rated components that burned out from normal use. You would think Apple would have been more careful the 2nd time around :-) BTW: While you are in there working on the analog board, check and possibly resolder joint J4 on the main cable on the center of the board. Its pin 1 on the cable. That joint was bad on I think EVERY Mac Plus I worked on. So there is a pretty good bet that even if you aren't having problems with yours now, you will in the future. The solder would split off the board causing the cable to lose connection, causing the video to blink out. Smacking the side of the case would cause it to restore temporarily... its the only time I've had a computer company give me an official "repair" of "whack the side of the case" =:-O -chris <http://www.mythtech.net>