T510 dual monitors no longer working properly

I have a T510 running Win7 64-bit. For at least 3 years, I have had the same dual monitor setup (2 DoubleSight DS-1900S) running off my minidock with the laptop closed. The rgith monitor is the primary, running off the DVI port, while the left uses the analog port. I was away for a week at Scout camp, powered on the system once while I was there, and when I came back to the office, my monitor setup started failing.
Specifically, the right screen is active but it no longer displays the signal being sent to it. When I powercycle the screen, I can see the display for about a quarter of a second, then it goes blank. When the problem first started, I could cycle it about 20 times and eventually it would stay on, until I left the unit overnight and it went to sleep, at which point the probelm started again.
Sounds like a wonky monitor? I have a backup set of monitors that I swapped in, and had the same exact problem, so that appears to rule out a mechanical defect. More fun facts: I can only use the laptop screen as a standalone display. I cannot get the multidisplay control panel to open, even though my left screen is powered up. However, one of my programs that normally launches to my right (main) screen will still launch, but not to my laptop screen. It really wants to live on my right screen, even when that screen is not powered on (I can close the program by accessing the icon bar at the bottom of my laptop screen).
As you might surmise, this is an extremely frustrating situation. I have gone on many trips with this laptop, and each time I returned, I either plugged it into the minidock with no issues, or I had to readjust my power settings briefly to get it to work as per usual. This time, I have no clue what went wrong. Suggestions?
Solved!
Go to Solution.

I have not changed any software or drivers (knowingly), and I had already checked the cables to make sure they were all tight, so off I went to ransack the house to dig out the spare cables. DVI cable? no change. Power cable? no change. Converter cable - OMG!!!! IT WORKS!!!!
Thank you SO much! I could have sworn this was a software issue, never considered a bad cable or power unit.
Both monitors are working properly, left-to-right scroll is working properly. Now all I need is to figure out how to get all my icons/shortcuts back onto the right screen...

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# XFree86 4 configuration created by pyxf86config
Section "ServerLayout"
Identifier "Default Layout"
Screen 1 "Screen1" 1 1
Screen 0 "Screen1" 0 0
InputDevice "Mouse0" "CorePointer"
InputDevice "Keyboard0" "CoreKeyboard"
EndSection
Section "Files"
# RgbPath is the location of the RGB database. Note, this is the name of the
# file minus the extension (like ".txt" or ".db"). There is normally
# no need to change the default.
# Multiple FontPath entries are allowed (they are concatenated together)
# By default, Red Hat 6.0 and later now use a font server independent of
# the X server to render fonts.
RgbPath "/usr/X11R6/lib/X11/rgb"
FontPath "/etc/fonts"
EndSection
Section "Module"
Load "dbe"
Load "extmod"
Load "fbdevhw"
Load "glx"
Load "record"
Load "freetype"
Load "type1"
# Load "dri"
EndSection
Section "InputDevice"
# Specify which keyboard LEDs can be user-controlled (eg, with xset(1))
# Option "Xleds" "1 2 3"
# To disable the XKEYBOARD extension, uncomment XkbDisable.
# Option "XkbDisable"
# To customise the XKB settings to suit your keyboard, modify the
# lines below (which are the defaults). For example, for a non-U.S.
# keyboard, you will probably want to use:
# Option "XkbModel" "pc102"
# If you have a US Microsoft Natural keyboard, you can use:
# Option "XkbModel" "microsoft"
# Then to change the language, change the Layout setting.
# For example, a german layout can be obtained with:
# Option "XkbLayout" "de"
# or:
# Option "XkbLayout" "de"
# Option "XkbVariant" "nodeadkeys"
# If you'd like to switch the positions of your capslock and
# control keys, use:
# Option "XkbOptions" "ctrl:swapcaps"
# Or if you just want both to be control, use:
# Option "XkbOptions" "ctrl:nocaps"
Identifier "Keyboard0"
Driver "keyboard"
Option "XkbModel" "pc105"
Option "XkbLayout" "us"
EndSection
Section "InputDevice"
Identifier "Mouse0"
Driver "mouse"
Option "Protocol" "IMPS/2"
Option "Device" "/dev/input/mice"
Option "ZAxisMapping" "4 5"
Option "Emulate3Buttons" "yes"
EndSection
Section "Monitor"
Identifier "Monitor0"
VendorName "SyncMaster"
ModelName "SyncMaster 712N"
Option "dpms"
EndSection
Section "Monitor"
Identifier "Monitor1"
VendorName "Acer"
ModelName "Acer 77e"
# HorizSync 30.0 - 72.0
# VertRefresh 50.0 - 120.0
Option "dpms"
EndSection
Section "Device"
Identifier "Videocard0"
Driver "nvidia"
VendorName "Gainward"
BoardName "NVIDIA GeForce 6800"
Option "TwinView" "on"
Option "MetaModes" "1280x1024, 1152x864"
Option "TwinViewOrientation" "Rightof"
Option "RenderAccel" "true"
Option "AllowGLXWithComposite" "true"
Option "Coolbits" "1"
EndSection
Section "Screen"
Identifier "Screen0"
Device "Videocard0"
Monitor "Monitor1"
DefaultDepth 24
SubSection "Display"
Viewport 0 0
Depth 24
Modes "1280x1024" "1152x864"
EndSubSection
EndSection
Section "Screen"
Identifier "Screen1"
Device "Videocard0"
Monitor "Monitor0"
DefaultDepth 24
SubSection "Display"
Viewport 0 0
Depth 24
Modes "1280x1024" "1152x864"
EndSubSection
EndSection
Section "DRI"
Group 0
Mode 0666
EndSection
Section "Extensions"
# option "Composite" "true"
option "RENDER" "true"
EndSection
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T510 dual monitors no longer working properly

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