ok so i instaled a new CPU cooler, and 3 fans to my home build computer, was going fine before that. but after today when i instaled these fans and cpu cooler it turn off after 15 sec, it boots up and shows a American Megatrends on screen and says it will shout down after 15 seconds! i dont know wasup!
What did you plug the new fans into? If nothing's plugged into the CPU fan header on the motherboard I'd imagine it could cause the BIOS to do that, not sure though. Are all the new fans you put in spinning? (just a couple things I could think of off the top of my head, hard to tell what the issue is without knowing exactly what you did/where you plugged things in)