Pentium 3 Slot 1 Heatsink Removal

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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.

Product Information

  • Now we are living in the Era of the Internet, and the Pentium III processor is the tool you'll want to make the Net come alive in your PC. The Pentium III takes the basic processing muscle of the Pentium II and adds new enhancements designed to increase the performance of 3D graphics, audio, and multimedia software. Here is the main thing home computer users need to know about Intel Corp.'s Pentium III processor: It's better than what came before. Other than faster clock speeds, the Pentium III supports 70 additional instructions intended to speed up programs that recognize spoken words, streamline programs using three-dimensional images and smooth audio and video playback.

Product Identifiers

  • Intel
  • BX80526H800256E
  • 0735858131476
  • 74098200

Product Key Features

  • 256 KB
  • Pentium III
Slot 1 cpu

Pentium 3 Slot 1

Additional Product Features

Slot 1 Cpu

  • Processor
  • Single-CORE
  • Pentium III E
  • Advanced Transfer Caché
  • PC
  • Dual independent bus, dynamic execution, superscalar, superpipelined , data dependency removal, multi-branch prediction, speculative execution, out-of-order completion, register renaming, IEEE 754-compatible FPU, MMX instructions set, system management mode (SMM), 100MHz front side bus, streaming SIMD extensions, seventh-generation, SEC cartridge 2 packaging, processor serial number
  • 1
  • 32KB
  • 256KB
  • 1X Processor-Slot 1
  • Intel Boxed-Retail
  • 800MHz