Total failure - black screen

Hi, I've joined this forum in the hope someone can help me with my problem as I need my PC back up as running ASAP for business use.

I built my system 2 or 3 years ago and haven't had any problems with it, other than the odd blue screen crash. Last time I had a blue screen Stop error it was a couple of weeks ago. Today I turned on the PC, inserted an SD card in my external reader to download some pictures to Adobe Lightroom, and plugged in my iPhone to sync. iTunes was sync'ing and Lightroom was finishing off the upload when suddenly both monitors went black. There was a small multicoloured pixelated line on the left side of both screens, about a cm wide, but everything else was black. I turned off the PC by holding down the power switch. Turning on the machine shows the Asus screen with Bios option, then it says "Windows failed to start due to recent hardware/software changes". It gives me the option of repairing which I do. I get the loading Windows file for a few seconds then it goes to black and nothing happens before the machine turns off. If I choose not to repair windows I just get a black screen and nothing, until again, it turns off.

System is:

Asus P8H67-m evo

Intel i5-2500k

16GB corsair xms3 Ram across 4 sticks (2 extra added 6months ago)

Corsair 128GB SSD added 6 months ago to replace old 60gb SSD

Corsair vx450w psu

3 x hdd - I media 2 backup

I'm running two monitors, the 2nd added 3 months ago.

Only recent software change is the addition of Sony media studio for video editing etc.

I've tried removing two of the RAM sticks and unplugging two of the HDDs too in case it helped the PSU (I'm clutching at straws a little) this had no effect.

The CPU isn't overclocked, but I did engage Asus' GPU boost feature some time ago.

When I go into Bios and click GPU boost, the PC instantly shuts down and restarts itself. When it comes back to life, straight into a black screen.

I'm at a loss. I'm thinking maybe a hardware failure rather than software due to the sudden black screen, but I don't know. Being unable to get anywhere near Windows limits my options. I don't have my Windows 7 disc with me at the moment to try loading from the CD. Please help.

Regards

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