You need a puller to get it off. And be prepared to PAY for a new one. DO NOT buy one from JC Whitney or the like as they will sell you the wrong one. I bought one off E-bay and it was incorrect too. Even after I asked the guy, hey it looks different, oh that's ok as long it bolts up..it didn't so he got it back and an earful. I was lucky and found a good one on an old PS box I had. I just used it. Manual and power are both the same.