New 660 ti installed, computer will not boot

[alsoodani]

Basically replaced a half dead vid card with a new 660 ti. I also put in a new power supply, a TX650v2, b/c of it's bigger wattage and the fact that it has 2 6v rails needed for this beefier card.

Ok, so when I installed everything, I went to turn the computer on and the computer would not boot up at all as if it was unplugged.

When I take off the entire video card from the computer, the computer will boot no problem.

When I have the video card installed, BUT the two 6v rails removed, the computer will start but will not get past a screen saying "Please power down and connect the PCIe power cable(s) for this graphics card." The vid card actually powers on and the fan spins.

Edit: Something to add to this, after the vid card powers on w/o the two 6v rails, I cannot get this message with the vid card with the computer to open like that again without switching off/on the power supply and replugging the power supply.

I place the 2x 6v rails back in the slot and of course the computer will not boot.

Things that I have made sure of/tried:

* graphics card and other components seated properly
* two main power supply connectors seated properly (20+4 pin) and (12v)
* CMOS POST battery removed for 4 hours and returned, reset to default, research showed this solved others similar problem

Is there anything else I can try here? I don't have my old vid card anymore and my older power supply has only one 6 v rail. I don't have integrated graphics so I can't open the computer w/o a vid card. I don't have a 4x PCI-e slot to test the card in or another 16x slot. I don't know what else to test. I'm currently at a complete loss of what to do next.

Specs:
* Phenom II 550BE (used to be unlocked quad B 50 x4, but I'm guessing with the CMOS reset it prob went back to dual core)
* Corsair TX650v2 power supply
* Gigabyte MA770T UD3P
* 12 Gigs of RAM (2x2gb ddr3 + 2x4gb ddr3 gskill)
* Sythe Mugen 2 heat sink
* CM690 case
* 1 tb Samsung f3 hard drive
* Samsung DVD burner drive
* 2 gb EVGA 660 ti

 

[Xtr3meGames]

Any beeps?

 

[alsoodani]

Any beeps?

No beeps unfortunately. Just doesn't turn on at all when both the 6v rails are connected to the vid card

 

[crzykid71]

You might have needed to uninstall the previous drivers from the old card before you put in this new one. If you can at least get into your bios screen and change boot order etc you can reinstall your os 'provided you have a copy of windows on disk' & you would be fine. but if your getting a total blank screen/ not seeing your bios post screen then you need to return your card

 

[crzykid71]

maybe your 6v rails are bad too... if you have any molex extensions you could try that method.

 

[Arcygenical]

Faulty card. IMHO.

 

[alsoodani]

You might have needed to uninstall the previous drivers from the old card before you put in this new one. If you can at least get into your bios screen and change boot order etc you can reinstall your os 'provided you have a copy of windows on disk' & you would be fine. but if your getting a total blank screen/ not seeing your bios post screen then you need to return your card

The previous card was an 8 series Nvidia card, it had the latest driver for 8 series through 6xx series. So I don't know if it can be a driver issue.

And yeah, when both the PCIe power connectors are connected to the vid card, nothing turns on, as if the computer was unplugged. If I unplug the power connectors, but keep the vid card in the 16x PCIe slot, the computer will turn on and the vid card will turn on, but will say to turn off the computer connect the PCIe connectors.

maybe your 6v rails are bad too... if you have any molex extensions you could try that method.

Yeah, if the PCIe connectors are bad, that would be a good way to test it. I don't have access to moles ext. but that will be my next thing to purchase and test. I might also use my older PSU (vx450) as a test once I get a molex connector. Just wish I knew someone with a rig powerful enough to take a 660 ti to see if it works...

Faulty card. IMHO.

My last resort is to exchange the card, when I run out of things to test. Damn I hate when there are so many variables but you do not have the resources to eliminate them....