The Hyacinth will come up eventually. Are you trying to grow this in the house?? I am guessing that you are, based on where you live.
How are you examining the root growth??? Are you digging it up and looking at it??? If you are don't do that. Just leave it, it will sprout. Is it in a sunny spot? If not move it to a sunny spot. You could put a little Miracle grow on it then in about a month put Miracle Grow BLOOM STARTER on it..Miracle Grow mixture 1 tablespoon per bulb for 3 days in a row. Then regular water for 3 weeks. Then Miracle Grow Bloom Starter 1 table spoon a day for 3 days...then regular water til you see a sprout..Then Miracle grow bloom start 1 tablespoon per day for 3 days again, then back to regular water. Make sure your pot is well drained too much miracle grow combined with poor drainage CAN poison the bulb.
Or you can use time released
plant food..Put time released
plant food just a little. Then time released bloom starter in about a month. Just a little, a tablespoon of water everyday per bulb.
The root base Does NEED to be healthy and established before you force a bloom or the
flower will not stand up straight, Or worst case will tip out of it's pot. A healthy root base also promotes the bulb to split..Meaning multiply to make more hyacinths for next year.