can someone explean this problem. i have a hp xw4400 and this motherboard should support the core2quad q6600 but it does not. so i switched back to core2duo e6600 and put 6gb ram in it instead of 4gb. and now the pc will not start and keeps beeping all the time and it will not stop. checked my ram and graphicscard and cpu fan and motherboard cables but the psu shutdown instandly with the computer if i want to try to boot. is my psu dead? of is my motherboard dead? please help me...