Cymbidium Golden Elf 'Sundust' HELP!

[InspirChid1712]

Cym. Golden Elf 'Sundust' are the only two plants I have that don't do ANYTHING! I take good care of all of my orchids, but I can't get my Cymbidiums to bloom. They just develop small, pathetic new growths all year long, and then just start new growths when the old ones mature. I leave them outside until the nights are cool in the fall, give them excellent light and fertilizer, water regularly... and I can't get them to bloom to save my life. I just use them as grassy decorative plants anymore, I've nearlly given up! Why is this supposedly easy hybrid giving me such problems, while every other orchid in my collection flourishes?!?!?! What tricks work for eveybody? PLEASE HELP!!!!