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