You said if I get no beeps, it's either the MB or the CPU? I just replaced the MB, and I'm hoping to the high heavens it's not the CPU. Would you still recommend attempting to replace/upgrade my power supply? FYI, I currently have a 300 Watt, and I had 2 graphics cards, a quad core CPU, a 1 TB HDD, 4 2GB sticks of RAM, two optical drives, plus numerous external components. Is it posible I overloaded the Power Supply and/or CPU?