GTX 750 Ti GPU: 6pin & Sound Card dead after installing new GPU - Advice please!

[columbia93]

I installed a replacement GPU from evga (GTX 750 Ti for 8800 GTS) on a system built in 2008 after being told by evga it was incompatible and then evga tech saying it would be fine. 24 hours later (12 hours give or take as the PC "slept" overnight) I shut down the system without problems but the next morning the PC lost power just after starting (before the Vista screen). Long story short, I tried a different PSU, different outlets, new MoBo battery (25 years ago I had an Acer that quit because of a bad battery so...shrugs!) taking out the GPU, etc. Nothing worked.

I ordered another PSU to see if it would work and oddly, found it didn't have the 6pin so didn't install the GPU. The PC started up. I took that PSU out and tried the old one again with the GPU installed, and it didn't work. After pondering the problem for a while, and having been convinced from the beginning that this was a problem with the GPU, I took it out again and the PC started up. I put the GPU back in and no power. I fiddled around with the PSU and discovered that one of my 2 8pins was actually a 6+2 so I hooked up the GPU with that and the PC started. Obviously I had a bad 6pin - which I didn't have before installing the GPU.

I started up the PC and did some basic things, like change the Time/Date because of new battery, and installed a couple of Windows updates. I then shut down the PC. Next I installed my Creative X-Fi sound card (PCI-e slot beneath the GPU) and turned the PC back on. Nothing. No power again. Took out the sound card and it starts. Now I have a dead sound card, which was working fine before.

While I'm waiting to hear back from evga, I need some advice about what might be the future for this card. If it were just the sound card, I would understand. But you have to look at the variables and that was the GPU and 2 simultaneous failures in direct/close proximity to that variable, you have to assume something else could be going on. I'm worried that if I keep the card, it will burn my other 6pin and perhaps damage the MoBo. Any explanation how these 2 failures/1 event could have happened? Likelihood of another failure? I'd just feel more comfortable talking with evga if I had more information...

Please note that I only returned my old GPU because it was sometimes leaving bits of pull-down menus on the desktop, although not a problem when in games. I also had a 3 year old Seagate go bad so decided to take advantage of the "down" time and take care of the GPU. Although the PC is 7 years old, it was working fine before I made the switch.

I have a Gigabyte Mobo GA-P35-DS3L (BIOS F7), Intel Q6700, 2x2G DDR2 RAM, Hauppauge tuner, 1 DVD recorder & 1 player, PC Power & Cooling 610W. Anything else?

Thanks to anyone who can help.

 

[columbia93]

I am going to bump this simply because there was a problem with the wrong thread being deleted so I want to give it a chance to be answered.

The above is the backstory. I still haven't heard back from EVGA (since 6/13)

I know my old Mobo BIOS doesn't have UEFI but I don't know if that makes it incompatible or just lacking certain features.

EVGA did at least say my 610 PSU would be fine.

I would like to know about the BIOS (compatibility?) as well as if there could be a correlation between a GA-P35-DS3L Mobo with a GTX 750 Ti and a 6pin and sound card frying at the same time.

If it is deemed that the GPU will work, is there any chance it will fry my TV tuner (in the PCI slot above) or even damage the Mobo?

If it is deemed that the GPU will not work, I assume I need a card that was manufactured prior to this UEFI thing...which would be....?
Any suggestions of a card that would work and equitably compare with my old 8800 GTS 512? It needs to work with The Sims 3, as that is my most intensive graphics software.

Thank you.