Based on the information you provided, the maximum resolution you can get is 1920x1200. This is based on the monitor specifications. You can check it here: http://www8.hp.com/us/en/products/monitors/product-detail.html?oid=5272780#!tab=specs
The graphics controller on your computer is capable to get resolution up to 2560x1600 but using Display Port connection only but this also depends on the OEM manufacturer since they are able to set limitation in their systems.
My best recommendation is to contact the computer manufacturer and confirm with them the maximum resolution you computer can get and also confirm the max resolution that the monitor supports.
The computer and monitors work great under windows 8 using drivers off the HP site. It is the Windows 8.1 that is throwing everything off.
That is why I was wondering if there is a way to force the computer to use a resolution that isn't listed in control panel.
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Do a windows search for CustomModeApp, you do custom resolution from there.
You can try doing the CustomModeApp search and create the resolution from there but it is important to keep in mind that the drivers we have for 8.1 are still BETA drivers.
This issue is present in the lates drivers from both HP and Intel, and a CustomModeApp tweak does not work.
What is the resolution you are trying to get? Can you post your dxdiag report here?
I'm having a similar issue. I recently purchased a Lenovo Ultrabook and have a 23" Samsung moniter (that has worked perfectly for 2+ years). The monitor display is all whacked with the monitor's edges cut off. When will Intel fix this problem?
Sorry to hear you are having this problem but I will make my best to help you on this.
At this point I am not sure what is your graphics controller or what the driver version is but have you tried playing with the resolution settings in your computer while having connected the TV?