How can i make my own powered risers? I saw some on ebay but they cost 5 times as much as the normal ones.
Good question, and not something I know enough about. However...
Your PSU was 1050w. You were pulling nearly 1000w from the wall.
My understanding is that PSU's "deteriorate" over time (based on power calculators), something about capacitor age or something. Someone who knows more may be able to chime in but I think this could be related? Ex. the power being pushed by the PSU decreased over time until it could no longer handle the load and then was overloaded.