Early season i had to hand pollinate early in the morning (they close up again by early afternoon) to get them going. And you gotta be diligent cause i find the female flowers tend to only open for a day or two. Is yours at least producing female flowers with a baby squash at the base of the flower?
Even then I can only get one (or two if im very lucky) to take at one time. 3/4 always end up shriveled in the compost pile (bad/no polination)