T60 with integrated Intel 950 graphics running W7 forgets display settings

[Muse]

This machine is T60 14.1" with Intel integrated 950 graphics. Twice in the last couple weeks the machine has seemingly spontaneously lost its graphics settings. I have the machine connected to a mini-dock and configured to output the main Windows 7 Home Premium 32bit screen via DVI to a 23" digital display. The VGA output of the mini-dock is output to a 19" digital display, so that I can drag non-maximized windows from one display to the other. This is my standard arrangement for this system. The 23" has native res at 1920x1080, the 19" display is set at 1280 x 1024.

The machine plain forgot the settings twice and I had to reset them, a royal PITA which required a reboot on at least one occasion. What might be happening here?

[RealBlackStuff]

A shot in the dark: replace the CMOS battery, it's probably near-dead after so many years...
Check in BIOS that Passwords are not set, or that you know them if so.

[Muse]

A shot in the dark: replace the CMOS battery, it's probably near-dead after so many years...
Check in BIOS that Passwords are not set, or that you know them if so.

Yes, I've never replaced the CMOS battery. When I do so, will I need to update a lot of info? I haven't made a ton of BIOS changes, IIRC, but I suppose there are some.

I've never set up any BIOS password stuff, so I don't know why or if I should look into that.

What/where in replacing the battery? I have a number of batteries on hand, in the refrigerator, maybe I have what I need for that. What does the T60 use?

[hhhd1]

My "guess" is that this is an old graphics card with old drivers, and this is some old forgotten driver bug, that neither MS or intel care to fix anymore.

[RealBlackStuff]

Get the HMM via the HMM link at the top of this page.
Remove palmrest and keyboard.
It's the small yellow battery under the mouse-keys, like this: http://www.ebay.com/itm/391144136868
You'll need to set date/time after that, nothing else really.