Hey, I'm having difficulty removing the Intel CPU fan that came with my computer. It's way too loud so I ordered a Zalman fan compatible with my motherboard. My motherboard is an ASRock socket 775, and my processor is Intel Pentium D (x2 CPUs). The Zalman fan came today, so I had a look at the Intel fan and tried to remove it. There are 4 fasteners on the fan that you have to rotate and then they pop up, which I have done, they are still fixed down, covering screws I guess? How can I remove the fan and heatsink to allow me to install my new Zalman one? Thanks for any help you can provide.