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I have a quad monitor configuration using a VisionTek ATI Radeon HD 5570 1 GB SFF 4-Port VHDCI x16 PCI Express Graphics Card. I've been using this same configuration and hardware for 2 years with no problems. It's been approximately 4 days since I applied updates to the system.

Yesterday afternoon while working, 1 of the 4 monitors just suddenly went black. The power light is still on (so it still has power). And if I reboot it will flash the "no signal" message (therefore, I don't think the monitor is completely dead), but nothing else.

I've done some searching, and I can't really even find a problem that sounds similar (but, maybe my googling is off).

Anyway ever seen something similar? If so, were you able to fix and how? If unfamiliar with the problem, how should I go about trying to troubleshoot? Graphics card system test?

Additional system info:

$ lsb_release -a
LSB Version:    core-2.0-amd64:core-2.0-noarch:core-3.0-amd64:core-3.0-noarch:core-3.1-amd64:core-3.1-noarch:core-3.2-amd64:core-3.2-noarch:core-4.0-amd64:core-4.0-noarch:cxx-3.0-amd64:cxx-3.0-noarch:cxx-3.1-amd64:cxx-3.1-noarch:cxx-3.2-amd64:cxx-3.2-noarch:cxx-4.0-amd64:cxx-4.0-noarch:desktop-3.1-amd64:desktop-3.1-noarch:desktop-3.2-amd64:desktop-3.2-noarch:desktop-4.0-amd64:desktop-4.0-noarch:graphics-2.0-amd64:graphics-2.0-noarch:graphics-3.0-amd64:graphics-3.0-noarch:graphics-3.1-amd64:graphics-3.1-noarch:graphics-3.2-amd64:graphics-3.2-noarch:graphics-4.0-amd64:graphics-4.0-noarch:printing-3.2-amd64:printing-3.2-noarch:printing-4.0-amd64:printing-4.0-noarch:qt4-3.1-amd64:qt4-3.1-noarch
Distributor ID: Ubuntu
Description:    Ubuntu 12.04.4 LTS
Release:    12.04
Codename:   precise
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Possibly obvious troubleshooting step - have you tried swapping the signal cable for that monitor with one of the other ones, so that it's plugged into a different port on the computer? Or plugging it into a different PC entirely? This should let you better single out whether the monitor's dead. –  Jez W Jan 17 at 16:31
Try swapping it with one of the working ones to see what happens as well. –  Mateo Jan 17 at 16:33
Both good suggestions. Tried to connect it to my laptop. No go. I think the monitor itself is done. I've had it for almost 5 years. I guess that's not bad for a monitor these days. –  David S Jan 17 at 16:58

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