Re: blown PSU
RMA = Return Merchandise Authorization.
When your product is under warranty, you can contact the manufacturer of said product and explain the issue you are having and they will review your request and issue you an RMA number. They will tell you to put this number on the outside of the package as well as inside the package. This number will be their record to track your issue and review your product once they receive it. After they receive it they will do either of the follow 2 things.
1.) repair the product and ship it back to you.
2.) replace the product and ship it back to you.
*** IN most cases, You must pay for shipping to return the product to them. They in most case, pay the shipping to get it back to you.
It's pretty simple actually, it does take some time, but yeah. Use the warranty.
Trust me, I've got at least 20+ RMA's under my belt in various products.