I have a somewhat serious problem with my PC. I bought (and assembled) it about a year and a half ago and everything was working fine until last week. Now, when I start my computer I have no display at all. Not even the bios screen. Nada.
I tried changing both the monitor and the video card with replacements that works on my other computer, but still nothing. The motherboard doesn't have an integrated video card and only has one PCI-express x16 slot.
When I start the computer, the fans start (CPU fan, case fan, video card fan too) but that's about it. The weird thing is that a week before I used it and everything worked just fine.
PSU calculators are a good place to start looking, but unfortunately, they aren't always accurate. 430W Output is a decent amount, but the load/rail is more important to understand.
Your PSU is a good one, but it may not have been enough for your system to begin with or it could've failed prematurely.
No boot/display problems (after periods of successful usage) are usually caused by a failing PSU, bad RAM, or something got into your case and shorted something. Check out the troubleshooting guide (the link in my signature) for PSU testing info.