hi guys im just fixing friends pc he has a weird problem. the problem is when he turns his pc on it yurns on but there is no posting i think, hdd led keeps flashing, and no signal on screen, and makes a weird noise that get higher and lower like a alarm, i tried replace the hdd but nothing i replaced the gfx card still nothing i replaced ram still nothing i have no cpu that i can use but cpus dont fuk up that often i think its the mobo wat u guys think