Hello Joe,
Thanks for your reply.
Please allow me to answer your suggestions point by point.
Intel HD Graphics 15.33.14.64.3412
The URL that you provided led me to a "Page Not Found". What happened?
But no matter for I discovered that the suggested driver happened to also be available on Asus' support website: Motherboards - H87-PRO - ASUS
Specifically the download link for the version 3412 is http://dlcdnet.asus.com/pub/ASUS/misc/vga/Intel_Graphics_Win7-8-8-1_VER1018103412.zip Note that the size of the download is about 231.93 MB.
Is this the same driver that you suggested that I download?
If it is the same driver, then I am sorry to tell you that installing it gave me the same issue as described in my original post.
Intel HD Graphics 15.33.0.3574 (beta)
Thanks for the suggestion, Joe. I hesitate in trying it out for the simple reason that if the same issue occurs, I will have to re-install Microsoft Windows OS and all the third party software that I need.
Version 3574 is still in beta.
Latest Asus H87-Pro Bios
The issue as described in my original post happened after I flashed the BIOS to the latest version, which is 1105. (The issue also happened with BIOS version 1103.)
In answer to your question, yes, I am using the DVI port. When I bought the Dell monitor U2312HM, Dell supplied me a DVI cable and a VGA cable.
Request to Joe
I have just learned that your colleague, Sylvia, recommended to me use another driver. Please surf to the following URL to read her reply: What are the differences between Intel HD 4600 graphics driver and Microsoft's standard display driver?