You've got atmosphere files on your sd card? you have fusee-primary in your bootloader/payloads folder? Your going to your sx boot menu, selecting cleanup then loading hekate in payloads?
I have a bit of trouble getting hekate gui to load correctly for me all the time so i've got this code in my hekate_ipl.ini file to autoboot into atmosphere.
Code:
[config]
autoboot=1
autoboot_list=0
bootwait=3
verification=1
backlight=100
autohosoff=0
autonogc=1
{------- Launch -------}
[Atmosphere]
payload=bootloader/payloads/fusee-primary.bin
icon=bootloader/res/icon_atmosphere.bmp
[Horizon]
fss0=atmosphere/fusee-secondary.bin
stock=1
icon=bootloader/res/icon_horizon.bmp