Xbox 360 Red Ring because no HDMI cable is connected? Is that correct?

I want to see an Xbox 360 with an HDMI connection afterwards. However, the seller does not have a television for testing (which makes me wonder). He also claims that the Xbox has the red ring when it runs on a console without an HDMI connection. Is that true, or is it a lie and the console is simply defective.

The red ring means something like "Ring of Death".

https://www.google.com/...h8Q4dUDCAw

There's no general answer to which one is defective in the console.

Ring of Death because of the HDMI cable? (I do not think so.)

Better not buy them. You should also make sure that she does not have a spell.