My friends F12 (Brother to H100) had the same issue.
What you need to do is remove all the outer screws to the amp and gently pull it away from the enclosure. Inside the enclosure you should see 2 connector leads (positive and negative) going to the sub. During shipping these connector leads...
Any of the Corsairs will do you well.
I used to have an HX520, and it was and still remains my favorite PSU ever.
If modular isn't important, be sure to look at either the 450VX or 550VX. The 450VX runs around $70 and will power your rig perfectly. :D