Makibes 7 " 1024 * 600 Raspberry Pi B 512

Hi everybody,
I have not been able to configure this screen.
With this in config.txt:
max_usb_current=1
hdmi_group=2
hdmi_mode=87
hdmi_cvt 1024 600 60 6 0 0 0
hdmi_drive=1
only I can to see the prompt in the screen on ask me user and password but never I can to see the correct graphic screen.
Can you help me?
Thanks. Regards!!