I need to replace the CPU/Case fan in a Dell Dimension 4500. My question is...does anyone have any instructions for removing the fan from the blower assembly mounted on the back of the case? Please do not post a link to the instructions on the Dell website. The instructions do not include the fan and/or the blower assembly. Not to mention that I have also been online with Dell Support and they don't even know how its done. I was hoping someone out there has removed the blower and fan assembly before.