Please edit your /boot/config.txt file with following contents:
# uncomment to force a console size. By default it will be display's size minus
# overscan.
framebuffer_width=1024
framebuffer_height=600
hdmi_force_hotplug=1
#hdmi_ignore_edid=0xa5000080
hdmi_cvt=1024 600 60 3 0 0 0
# uncomment to force a specific HDMI mode (this will force VGA)
hdmi_group=2
hdmi_mode=87