I was trying to boot up my mother's mac mini but the only thing that turns on is the fan. It seems the fan is blowing at max from the back. The light on the front isn't on. When I try and turn the fan off by depressing the power button for 3 seconds it doesn't turn off. The only way to turn the fan off is to unplug the computer. Oddly, the power light in the front turns on when I plug in the 7-port usb hub in the back.
I'm thinking possibly the motherboard of perhaps the cpu.
If is the mb then I'm guessing the only place to purchase a new mb is to buy it from a mac store or online from apple.
Any other ideas as to the why it doesn't boot? It was working fine last night though so I don't know what could've happened.