Reminds me of the time I was working on my HP9817. This machine has a special HP-badged (ut made by Samsung) monitor, with IIRC a 22kHz horizontal freqeucny. Anyway, I left the monitor turned on, and was powering the CPU box up and down while tracing faults on I/O cards. One time, when I had the monitor on but the rest of themachine off, the moniotor emitted a 'pop' followed by magic smoke. Of course I turned it off. I then pulled the cover off the monitor [1], worried that the (totally unotainalbe) flyback transoformer had 'run down the curtain and joined the choir invisile). I was very releived to see that one of the mains filter capacitors had split open with mtalised paper coming out. I desoldered it, and knowing a monitor will work without the mains filter capacitor, tried it again. Fortunately, it worked fine. And a couple of weeks later I fitted a new set of capacitors in that area. [1] Not that easy. You remove the clip-on bezel (which might be a touchscreen...) around the tiltable CRT. Undo the 2 screws above the CRT, then refit the bezel, put the monitor face down, and take out the 4 screws on the bottom. Lift off the cainet shell, then remvoe 4 more screws that hold an access cover under the main PCN. The procedure to totally remove that PCB has 25 steps... -tony