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

agcereniv

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Aug 9, 2015
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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.

And when I say boot, I mean won't even get to BIOS - or, if it is, there is no signal going to the monitors from either card. I should also indicate that the lights on the mobo are on, fans turn on, etc, so I don't think it is the PSU?

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?
 

agcereniv

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Aug 9, 2015
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It is PC Power and Cooling S75CF 750W EPS12V SLI Certified. That said, both of the 8 pin PCIE cables were already in the first card, so I used in-box EVGA adapters on two other 6 pin to turn them to 8-pin for the second card. The PSU was also purchased in 2/2009, so, it failing is a possibility.

http://www.newegg.com/Product/Product.aspx?Item=N82E16817341011

Also, I tried installing a completely different GPU last night to test - different manufacturer, still nvidia, but a 700 series - same effect, no signal to monitors.
 

agcereniv

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Aug 9, 2015
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That may be! I ordered the replacement 850W PSU, as well as new updated components. But, *lesigh*, I'm going to have to put in the new PSU, power up, prep the OS for new mobo & proc, then migrate. Oh, well.
 

agcereniv

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Aug 9, 2015
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I'll have to keep pcpartpicker in mind. I took the opportunity to upgrade the mobo, proc, ram, psu and case as a result of this, and there was a bunch of sales for them.

After getting the parts and getting the psu in the original case, I prepped Windows 7 for OOB then disassembled the old rig and assembled the new one. Getting past the initial Windows migration start up, I then began to experiment with the cards and discovered that one of the 690's was shot - so, I'm back to the one 690 (I think it is the one I got instead of my original) plus a GTX 770 dedicated to PHYSX. And the set up is now ready to grow later with more ram, water cooler, better GPU in the future (the other was at the top of its potential).

Thanks for the help!
 

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