Crazy sudden problem, possibly power related

hi forums, my first time posting...
i turned on my computer today to discover that my 2 screens were just blank, appeared to get no signal from the computer.  i figured it must be something to do with my graphics cards (2x geForce 7800 GTs in SLI) so tried removing one.  i noticed that when i was restarting the computer that sometimes it would power up for about 2 seconds then switch off again, so i assumed it was a power issue, like not enough power getting to the graphics cards thus blank screens. i tried disconnecting my cd/dvd drives, additional graphics card and hard drives but same issue. i tried replacing the power cord and even the 450W power supply unit no diffirence! i'm trying to figure out if it might be something to do with the motherboard, i've checked that everythings plugged in proberly.  all parts are about 6 months old, built myself and no problems until today.  wondering if anyone has any idea whats wrong or has experienced something similar...???
k8 diamond plus
AMD X2 4400 processor
2 x geForce 7800 GTs in Sli
450W Raidmax power supply
2x 300Gb ATA HD's
XP media center

That's a €/$ 38.- PSU, with like 14A @ 12V, that will never run your system properly.
Not even with 1 card.
You have been lucky it booted at all in the past.
Try something like this: >>OCZ Powerstream 520W<< about €/$ 139.-
Nice 33A @ 12V, that should do the trick
Or even better this one: >>PC Power & Cooling 610W<<
About €/$ 150.- but has an even better 49A @ 12V!!
If you build a high end system, get a high-end PSU to match it.

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