I just got a rigol DS1024Z and decided to try to fix a speaker system that has issues with the main speaker not sounding(before I could hit on it a few times and it would come up, now nothing). I used connected the tip of the probe to a trace and it immediately sparked and noise was output on the working speaker. Obviously a probe shouldn't do that as it's suppose to be hi-z. Note that the ground of the probe wasn't connected, but again, that shouldn't matter. I connected a volt meter to the same spot without issue.
Pretty much all the gear is connected to the same outlet(they do come off two different power strips though, but that shouldn't really be a problem. I'm sure the scope isn't floating or much different voltage than anything else. But surely this shouldn't happen otherwise? If the probe is hi-z and it sparks on what is probably a 12-15 system, then something is wrong! The spark wasn't just a minute one from static electricity but significant(but not like it was mains).
Any ideas how to resolve this? I was able to connect it to the input to the amplifier, which comes off the pc) and no spark