What temps are you getting? Most Pascal cards won't have their fans spin up until its above 60C on the core. Has it been move recently? Have you used afterburner or any other software that can control fans recently? Make sure all cables are connected correctly. The best next step would be to get an RMA from whatever company the GPU is from if the above does not help They will be able to fix it without voiding warranty or send you a new one if it is faulty.