1 - 4 uren
iMac slow compared to similar macs running SSD disks
I used this video only as I could not find this guide at the time iMac Intel 21.5" (Mid 2011) Dual Hard Drive Kit so I skipped the RAM removal but I did remove the IR receiver in order to get the motherboard out and put it back in. Once I had fully reassembled the iMac there was a loud fan noise, I assumed it was the hard drive fan and Googled fixes for that installed and removed both fan fix Apps (http://www.hddfancontrol.com & http://exirion.net/ssdfanctrl) neither had any effect and both showed the hdd fans to be operating normally. I then installed http://bjango.com/mac/istatmenus which immedialtely showed me it was the CPU fan which was spinning wildly. Google results told me it could be loose connector on CPU fan or even screen connector not properly attached. I removed the screen and checked all connectors taking special care with the CPU fan and screen connectors and it now works perfectly. I did a clean install on the new Samsung 840 EVO 250GB SSD using the cmd and r command, installing from the internet over fixed wire lan. I did not need any fan management software in the end. Enjoyed the experience and good luck to those of you brave enough to try.
Take your time, dont panic, use some form of screw management system, vacum & blow away all dust good lighting is important. Make shure all connectors are properly connected especially main display connector as its not as straight forward as others.