Recently, I bought the following hardware components in order to upgrade my old computer; Intel E6300 Core 2 Duo Processor (Retail version) Gigabyte GA-965P-DS3 Motherboard OCZ 2GB Kit DDr2-800MHz Ultra Platinum 550W Power Supply (SLI Ready) Westrern Digital 250GB SATA II 7200RPM Internal Hard Drive After installing all the above items in the computer case, I tried to power it up for the first time. Unfortunately, the fan of the CPU and power supply began to spin for approximately a few seconds, slowed down, stopped and began to spin again. It went into a loop process. After speaking to the technical support of Gigabyte, I removed the system board, CPU and its fan out of the case. The fan ran steadlily without stopping if I only connected the system board to the power supply alone without the CPU and its heat sink/fan. The problem re-emerged after I installed the CPU. Therefore, it seems like the CPU socket on the motherboard or the CPU itself might be the cause. I replaced the motherboard with MSI 975X Platinum, and I replaced the power supply with ThermalTake 500W PS unit. Problem persists. It seems like the CPu itself is the problem now but I hate to go out and buy a new processor for the sake of confirmation due to the return policy of the CPU. I wonder did anybody experience this type of problem before and might be able to offer me some ideas. Personally, I dislike the LGA775 socket design since the pins on the socket could be damaged easily. Your opinion is greatly appreciated. Thanks.