I want to start my own business and may have signed a no-compete clause, will it hold up in court?

I've worked for a sign shop for 9 of it's 11 years and have been instrumental in the growth of the company. Last year during a slow time my boss asked to meet with me and told me that nothing (employment) was gauranteed after the current month (last Feb.). Shortley there after i got a business licsense with my partner and started doing side jobs (i have a family of five to support) just in case i lost my employment. I still presently work for the original sign shop (things picked up), i'm the only full time employee. This past fall i took my name off the side-business and my partner opened a storefront (signshop). I am now wanting to work full time at my own business with my partner, but i may have signed a nocompete clause 9 years ago (not a 100% sure). What can i do? i haven't had a raise in 3 years, no retirement, no insurance, no benefits. Let me know.