PC Won't Start - No Power?

I've been having some serious power issues with my 3-month old PC for a few weeks now. All was working perfectly fine until the PSU (450w "Zorro" PSU - came with my case) accidentaly got switched to 115v mode while still plugged into the computer and plugged into the 230v mains.....oops. Needless to say it did not survive the experience, and it was sent off and duly replaced with an equal model.
Then, I installed this PSU into the case and plugged it all in. The computer booted, as did windows, and all seemed OK.... at the desktop at least. But, whenever I got into a CPU and graphic intensive game the PC shut down. And wouldn't turn on. That was, untill I took the power plug out of the back of the PSU and then re-inserted it, at which point I could start the system up again. And once agian it would crash, most often while playing Unreal Tournament 2004 "Carball" mod. Prime 95 also crashed the PC after running for about 1h30mins.
Anyway, thinking the PSU was at fault i returned it once again. This time, the company tested it and said it ran perfectly for 4hrs with no faults. So, upon recieving the PSU back, I duly reinstalled it into the case. After reconnecting all of the cables etc, I pressed the power button. Nothing. Nada. System just won't start at all. And i'm completely baffled as to why.
I have tried plugging in the power connectors to the Mobo (K7N2 Delta ILSR) again, both the 20-pin and the 4-pin one. I have tried pushing in the power switch connector again, and tried reversing it, incase I had it pushed in the wrong direction, I have tried resetting CMOS and setting J10 to safe mode. I have also checked that the CPU cooler is attached and plugged in properly. I am stuck for ideas here, I really am. AFAIK the system hasn't been touched since I took the SPU out, so I'm not sure why it isn't even booting at all at the moment.
If anyone has ANY ideas about this, please don't hesitate to mention, even if it is the stupidest idea you've ever had lol, I'm really stuck with this. I'm thinking of taking everything right out of the case and installing it all again, but I want to know if i've done something really stupid and abvious before I do this. Thanks
BTW, my system specs are as follows.
Zorro PC case AKA Raidmax Scorpio 868
450W Zorro PSU. +5v 25A, +12v 30A
MSI K7N2 Delta ILSR
2x512 Sticks Samsung M3 3,3,3,8 RAM
Power Color Radeon 9800 Pro 128mb
D-Link DWL 520+ 22mbps wireless network
AMD Athlon XP 3000+ 1.65v Stock Settings
Zalman CNPS 6000 CPU cooler @ Max
5xCase Fans
MSI Audio Bracket Thing
40GB Maxtor HDD
60GB Maxtor HDD
Samsung CD-RW and DVD (not writer) 52x48x24x16

That was what iI am starting to think now, but there are some problems with that theory. Firstly, when the PSU blew up, after I got the replacement the PC did actually start up, and could run at the desktop for absolubly ages, >10hrs, while playing music and browsing the net, but when running stressful programs it turned off. Also, I tried a less powerful 400W PSU in the system, and that seemed to perform perfectly fine indeed. I also ran Memtest 86+ for a while, it did 6 passes, I think, without problem. I do have other systems, but none of them would support the proccessor or RAM.
I think the problem MUST lie with either one of 3 things.
1) The power button connection has come loose. Although I have checked it on the Mobo I can't actually check it at the power button itself as it is hidden. I might try and multimeter the cable to see if it is connected.
2)The power connectors to the Mobo. These connectors could be broken so the system isn't getting any power. Alternatively it could be the slots on the Mobo.
3)The CPU fan connector. This could be damaged and cetain motherboards don't let the power be started up without the fan being connected. Dunno if the K7N2 series does though.
4)The mobo itself is damaged and won't work.
Whats also puzzling though, is that the system kept shutting itself down and then wouldn't turn on again unless the power plug was removed from the back and reinserted. Any idea why this might happen?
Also, on the components damaged issue. The motherboard should start up without the processor, Ram, Video card etc installed right? Otherwise what is the point of the MSI D-Bracket LED diagnostic system thing? This displays certain LED patterns when the system has a fault, for example a faulty or damaged processor etc. Therefore the systme must be able to get power without a working processor etc. For this reason I think it must be one of the reasons mentioned above.

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Working battery needs to be in for the computer to function.

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Marnie Glickman-
Could be a variety of things, but most likely your hard drive is not happy. The flashing question mark means that the system is trying to find a working disk with a valid system on it. Should be the hard drive. Isn't.
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