This is the screen on my Tektronix 2465 oscilloscope when I power it up. It used to have the lines going all the way across and and when I would connect the probe to the stereo output (as a calibration test) I'd get a waveform.
But now there is no waveform at all, just faint vertical lines when I supply input to channel 1 using the probe. Has anyone else seen this problem before? If you have please tell me what causes it and how I might fix it!