Can anyone tell me if the CPU I just bought is compatible with my computer? I have a Compaq Presario S6000NX with an Intel Celeron CPU running at 2.7 GHz. I just bought an Intel Pentium4 Processor (2.8GHz)with Hyper-Threading technology. Of course, both of these CPU's have the same socket size. When the Pentium4 was installed, the computer did not power up. I also just upgraded my power supply to 550W. I welcome any questions or information on my dilemma.