Research available schools to see if there are any colleges that accept a 2.4 GPA. They may be difficult to find, but they do exist. For example, the California State University offers an RN Advanced Placement Track program, and the GPA minimum is 2.4. The "Nursing Programs" guidebook provides a complete list of nursing programs and their requirements and is available online as well as at most bookstores.
Consider a community college as a way to improve your qualifications. If you are truly serious about working in the health care industry, there are plenty of community colleges that provide practical nurse training and don't impose the strict GPA requirements that many universities do.
Consult with the nursing admissions department of the university that you want to attend and ask if it is willing to consider a 2.4 GPA under exceptional circumstances. The GPA requirements are not the only factor to be considered by an admissions board. Life experience, volunteer work and passion are also important. If your school of choice places special consideration for those with volunteer work in the health care industry, make sure that you fulfill all other possible criterion before you apply.
Retake the required courses to help build up your GPA. Most students find it easier when they take a course the second time because their understanding has improved. If your school of choice is strict about imposing the 2.5 GPA requirement, then you'll need to consider retaking some courses until you improve your GPA.