P7N2 Diamond won't boot. Any troubleshooting possible?

Hello,
I have the following set up:
P7N2 Diamond | Core 2 quad Q9450 | MSI geforce 280 Super-OC | Corsair TWIN3X 1333MHz DDR3 4GB
The system was working fine for a month, today Windows was running a bit slow so I've rebooted the PC. It could never boot again.
When I switch it on the screen stays black.
- I have reseted the CMOS with power cable unplugged
Upon start up:
- All appropriate LED's light Blue, Power LED lights Red
- Graphics card showing Green light inside
- Graphics card cooler fan starts up
- No LEDs light on the keyboard
- I've unplugged all SATA and USB cables, unplugged keyboard/mouse and network, taken out the sound card
- The screen still stays black
As I've bought this gear in an online shop it's very akward to send all parts back to them.
I need your expert advice on where the problem might be and more importantly as I don't have any spare parts..
is there any further troubleshooting I can do? Do you think it's the motherboard or the CPU or something else?
How do I find out without any indications from the motherboard (old motherboards used to bip)?
Thank you very much in advance.

Quote from: RemusM on 01-October-08, 15:41:02
Except that GTX 280 (already overclocked), did you overclock anything else?
In any case, you need to borrow another PSU and another (nVidia) graphics card first of all.
cheers
Yes, i run my Q9450 2.66GHZ at 3.4GHz at Vcore +0.125V
I mean the system was working fine for 1 month, no problems at all and then just suddenly died, all LED's and indicators light Blue and Green, does this not imply that the power is OK?!
Is there anyway to tell which component is faulty, like a dead CPU? I don't have a speaker in the case so I can't hear any bips.
It's also not possible to borrow any spare parts from anywhere :( it really sucks

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