I have no signal to the VGA monitor (the monitor is a bit older). The other connections work.
However, I haven't connected the power supply to the HUB because I don't have a cable for it yet. Can this be due to the monitor on the hub or the unconnected power supply?

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Answer

Personally, I have no problems with VGA even without a separate power supply for the HUB (the laptop supplies the HUB with power), so in your case it must be the cable or the monitor, or possibly a technical defect in the HUB. What is not possible, of course, is the simultaneous use of both monitor ports (HDMI and VGA), but this is then a limitation of the laptop and not of the HUB.

Try connecting the cable and the monitor to another computer to check the correct functionality of both.

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Question about Lenovo Travel Hub

I have no signal to the VGA monitor (the monitor is a bit older). The other connections work. However, I haven't connected the power supply to the HUB because I don't have a cable for it yet. Can this be due to the monitor on the hub or the unconnected power supply?