My main oscilloscope is a Tek 465M. I recently noticed an issue with it where the trace did not extend to the screen's edges properly. I determined the issue was the 95 volt rail, and found some suspect capacitors. To access and replace them, I had to remove the vertical module (which pulls out all in one piece in this scope). Upon powering up, the trace was way off the screen's top, and could just barely be brought into view by turning the position control all the way to the end. It was also extremely fuzzy. I figured I must have not properly connected something on the vertical module, probably the connection to the y-deflection plates. I removed the module, reconnected all external wires, and reseated the main connector. Upon applying power, the HV supply makes a loud, high buzzing sound. I'm not sure why this is the case, or if it is dangerous to leave the scope running in this state. Any ideas?