430 should be ok but then again a little bigger would be better.
Sean lets test some of your hardware.
Try 1 stick of
RAM at a time and reboot each time you take one out and test the next.
Double check your connections and see if your
CPU is getting hot or how do your fans sound on running?
Are you able to get into BIOS?
So you have not overclocked?
If you can get into BIOS check a few settings in there?Did youchange any speeds on
RAM/
CPU etc?
This does seem like a hardware issue though.