Hi, I have upgraded my desktop, Motherboard for Dual Core, Power Suply, RAM, are all new. I used my previous HDD, DVD ROM and tower case. And I install all this together, while carefully following t he instruction on the manuals. But when I press the power on button, the case fan, cpu fan will only power up for a second and will turn off again and tottaly will not function, I have repeated to turn it on it all the same will power up for a split second and will stop. Any idea what causes this problem.. Need your help.