Try connecting the Monitor to the Onboard Display port, not the GPU display port and see if you get to the BIOS screen.
If you do, then in the BIOS you need to change your Primary Display Adapter from IGP/Onboard to PCIe.
After that save and exit and then connect the Monitor to the GPU display port.
It ought to work, usually the BIOS detects the GPU in the PCIe slot and makes it the primary one, but, sometimes this does not happen until we tell it to.
Another short note. I can't find your 4Gb Single Slot of RAM on the QVLhttp://download.gigabyte.asia/FileList/Memory/mb_memory_ga-m68mt-s2_v1.3.pdf