It looks like the monitor's EDID is not been detected properly. In order for all supported resolutions to be available, the monitor drivers need to be loaded.
Contact the monitor manufacturer in order to obtain the .INF file to install the driver.
If you are interested in additional information please check below:
Sorry for my late reply here, been swamped lately with other things.
Where did you see this about 24Hz refresh rate? My printed TV manual, on page 13 has the list of resolutions on it. The only row with 1920x1080p selected has a vertical frequency of 60Hz listed.
Even given that, I can't find 24Hz displayed anywhere. Even if I go into the Windows settings for the monitor and uncheck setting that hides unsupported frequencies, it still doesn't show up.
Something I did not mention in my original post, in case it becomes relevant:
I am connected using the HDMI out on the motherboard, through an audio receiver (which also supports HDMI), and then also as HDMI from the receiver to the TV.
The HDMI video resolution setting on the receiver is set to "pass through" (other options are choosing a sepcific resolution)
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The latest user manual can be found here: http://www.samsung.com/us/support/downloads/UN55D6000SFXZA
The supported formats are on page 166. The manual is used for the entire lineup so just ignore the fact that it says 3D.
I am connected the same way, through a receiver via HDMI then to my TV via HDMI and everything works great. If you are using intel graphics try this:
Right click desktop -> Graphics Properties
General Settings -> Refresh Rate -> 24Hz
The refresh rates I have listed are 23, 24, 29, 30, and 60.
Here is a picture of my settings, sorry for the bad color im remoting in:
OK, so when I got home, I noticed there was a newer set of drivers out (apparently came out right after I started messing with this originally).
Uninstalled those, rebooted, installed the new ones, rebooted.
It defaulted me to 1920x1080 @ 75Hz (!).
The receiver (and TV) both indicated this was 1080p (despite the higher refresh rate - which the TV refused to display earlier...).
If I open the intel app - the ONLY refresh rate available to me is the 75Hz.
So, I'm basically in one of those "I don't know why this is working, but the picture looks nice and crisp, I don't want to touch it" states.
Which just leaves me with one more question - what did you do to adjust the overscan? Some places I read said to set the Intel software to Custom aspect ratio and adjust the sliders down to compensate. However, every time I've done this, the TV just gives me a blue-ish screen. The intel software does NOT apparently revert this setting if I don't confirm after 15 seconds or whatever. My only option then is to reboot it into safe mode, uninstall the drivers, reboot normal, then reinstall and reboot again. That gets me back to the "good" state.
I didn't touch the overscan settings in the intel control panel. I set the TV to "Screen Fit" using the P.SIZE button the Samsung remote. If you set the TV to 16:9 it cuts off some of the picture, but Screen Fit seems to fit perfectly. It even lets you move the screen with the arrow buttons one line at a time so on the SD channels you can get rid of that top line of blinking white that a lot of Samsung TV + DirecTV users experience.