Here are a few more things you could try to fix your issue;
Go to your motherboard manufacturer's website. Download and install any recent BIOS update.
Instead of using the 9.1 driver
, use a much less recent one like 8.12
Finally, a hassle free and convenient way of manipulating display properties is to use Power Strip by EnTech which can be downloaded from here
Please read the site FAQs/Help before attempting to play around with your resolution. Use only the resolution that you think is right for your display. Improper use or forcing your hardware to exceed it's max rated performance might permanently damage your hardware.