Member Avatar for eva4art

I have a Dual 2 GHz G5 with OS 10.3.9 and a HP MediaCenter with Windows XP. Each computer is connected to a Princeton VL1916 flat panel monitor. Since they are connected to these monitors none of my computers would hibernate or shot down unless I disconnect the monitor cable from the computers. What is the problem and can it be fixed?
I would appreciate any help or suggestion.

Eva

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A short expert note tying the replies together and a focused diagnostic sequence.

— was right to start with drivers and power settings, and touched on cable/handshake issues, but the most practical way to find the root cause is a short, ordered set of hardware and OS checks. Monitors can present extra devices (USB hub, audio, HID) or assert monitor hot‑plug/DDC signals that keep the graphics stack or OS from completing power transitions; a faulty video cable can produce spurious hot‑plug events that look the same at the OS level.

Recommended diagnostic sequence:

  • Confirm reproducibility with one host and one suspect monitor only (isolates which monitor is at fault).
  • Swap the video cable and, if possible, try the other video input type (DVI vs VGA) or another known‑good cable.
  • Unplug any non-video connectors on the monitor (USB upstream, audio). If the monitor has an OSD option for DDC/CI or DDC, disable it and retest.
  • On the Windows XP machine update the video driver and check Device Manager for any unknown/USB devices; review Event Viewer around the attempted shutdown. On the Mac, check Console logs for shutdown/hang messages and try safe boot.
  • Boot a small Linux or rescue CD/USB and attempt a shutdown with the same monitor attached; if the problem appears across OSes it points to the monitor/cable hardware.

A few clarifying notes: "Termination" in the sense of VGA signal reflections is unlikely to block an OS shutdown; the important signals are DDC/Hot‑Plug Detect and any USB devices built into the monitor. If all tests point to the monitor, document the model/serial and test steps and contact Princeton support for a possible hardware/firmware fault or RMA.

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Member Avatar for Johnathan

First do you have your setting correct for the monitors like did they come with drivers or what not second check your display settings as well as your hibernation settings. This isnt a problem I have seen before but either of these could cause the problem.

Member Avatar for eva4art

Thank you for your reply Johnathan.
The monitors did not come with drivers. Princeton says it is not needed and the monitors are PC/Mac compatible. They are recognized by both computer. All the settings are correct. If I connect an other monitor everything works fine so it isn't a settings problem.
Thank you for your help.
Eva

Member Avatar for junt

The only thing you got to do is disconnect the other computer when you you are using the other for it has something to do with the termination of its cable that flags down the hibernation effect for it relies on the signal flag from the monitor that you are using.

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