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Previously working PC won't boot - will power - after attempting SLI

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Good afternoon/evening!

Yesterday, after attempting to install a second matching GPU for SLI, my computer would power on but would not boot. Today, I've tried every troubleshooting measure I can think of, but still no luck. I can't even get it to boot under the original configuration. Specs are below, and a list of the things I've tried so far follow, including some observations.

Mobo: Asus M3N72-D
CPU: Phenom II x4 955 (w/aftermarket air cooler)
OS: Win 7 x64
RAM: 8gb 240-pin DDR2 1066 (4x2gb)
GPU: EVGA nVidia 690 GTX (both original build and twin for SLI)
HD's, all in SATA, no arrays: OS - 1x 100gb SSD; Media: 1x 1TB HDD, 1x 500gb HDD
Optical: 1x Bluray Player/DVD Burner Combo in SATA; 1x DVD Burner in IDE

I've tried clearing the jumper, taking the new card out (original spec), putting the new card in the original PCI-E x16 slot, putting the original card in the PCI-E x8 slot, and having both cards in both slots both with the SLI bridge and without it. I've checked all the connections to the mobo of all drives and their power. I've also tried each of the monitor connections in each of the instances and cannot get a signal to a monitor (they are HDMI monitors) using any of the the DVI-I, DVI-D and Mini Display-Port on either card.

Now, in some cases, the HDD light on the case will glow solid, and some times it will be on as normal; if it is solid, I have to hold the power button to force a shut off but if it is normal, the computer will shut off as soon as I press the power button. Also, when normal, power is going to the keyboard, but when solid, no power to it.

Clearly my components are a bit dated - I'm shocked they've basically lasted 5 years (no OC) - but I'm hoping that the system is not fried? Help?

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