I just want to get a second opinion before I go the route I think I need to take.
Bit of background:
I have my cousin's desktop here that I'm working on. A few weeks ago while I was in the middle of doing a Windows Update, the PSU blew, literally. I suspect the PSU was flaky anyway. So it popped and I went and got him a nice new one. I put it in, but the machine was still acting a bit flaky. He was using an extremely low profile video card (I think it was a GeForce 210) and has an HDMI splitter running off the machine. It kept hanging after the monitors/TVs would go to sleep. Sometimes while watching videos after a few minutes the entire machine would just turn off. I did some digging and the temps were all fine, there weren't any errors in any of the logs, it just kept acting wonky. So I said, bite the bullet and get a better card. He doesn't game at all and mostly just browses from the TV in the garage so I figured a newer low profile would be fine. Picked up an evga GT 640. I put it in the machine and had nVidia clean out the old drivers and do a clean install. It seemed to go perfect until nVidia Experience said there were newer drivers. I let it do it's thing but it failed on the driver install.
I did some more digging and found this wasn't uncommon lately but nothing I tried forced the drivers to install. Ultimately, I opted to reinstall Windows. I reinstalled Windows 7 64-bit, downloaded the latest nVidia drivers and low and behold, they failed to install. There was one abnormality I did notice that I couldn't resolve even with a fresh reinstall of Windows. The integrated graphics kept showing up under Display Adapters in the Device Manager. Thing is, nothing is/was plugged into the motherboard's VGA spot at all. The bios is set to PCIe as the default video but it just won't go away. At this point I was wondering if the new video card was borked so I took it out and put it into my HTPC (which has an AMD CPU with integrated GPU on the chip). As soon as Windows came up, I went into the device manager and it shows only the GT 640.
Is the motherboard pooched in my cousin's desktop? I'm beginning to think it is. Maybe when the PSU went it caused some damage to the motherboard?
Any ideas? Thanks!