That took a while, but I finally got another PSU. It's an Antec TruePower 480
Link
The thing is, there's still no juice. I'm still open for suggestions here on my next step.
The thing is, I don't know if it's a bad PSU, or if there is something else causing the problem. The CPU is my next target I guess, but if the CPU goes, I'll end up getting a new motherboard as well.
This is costing me more than I had hoped, but I guess I can't do too much about it, eh?