We need dxdiag and files from this folder for solve your problem. C:\Users\<Name>\AppData\Local\Arma 3 Alpha\

Can you upload somewhere in winrar package please?
When package will be smaller than 5,000k, so you can attach here. Thank you.

http://feedback.arma3.com/how-to-user.html.html

My apologies, I've reuploaded the required files in the .rar file.

1. Can you try please install latest graphic and sound drivers? Usage of drivers cleaner before installing new drivers will make sure you have no corrupted drivers left on computer.
2. Can you try please install latest DirectX runtime (http://www.microsoft.com/en-us/download/details.aspx?id=35)
3. When you have overclock your hardware, please try go back to default values.
4. When you use speed fan software, so try set to default values.

Please try use -nobenchmark command line option.
Right click on Arma III in your Steam Library>Properties>Set launch options

Now it's working, it seemed there was something wrong with the driver's update but the weird starting screen background still exists. I've tried reinstalling & caching the files and all that but it is not helping. -winxp command line wont help either.

Issue closed as obsolete. If you encounter this problem again, please create another ticket. Thank you.