Issues trying to troubleshoot PCI Express slots

[ZooAnimal]

In the interest of brevity I'm going to be as abbreviated as possible.

PSU started smoking and reeking of ozone
Power cord was removed ASAP
PSU replaced with spare with same wattage, 750W
PC put back together, powered on fine but no video output
Swapped HDMI cable to integrated port, video works
Checked Device Manager, GPU (1070) is missing
Checked BIOS, GPU is missing (MOBO is an MSI Z97 Gaming 5)
Verified GPU is seated properly and has power
Verified BIOS settings are set to prefer PEG over IDG
Updated every driver possible
Can't update GPU driver as installer doesn't detect the GPU
Purchased new GPU, 1070 TI - same problems

I've been following all the troubleshooting steps I can find through Google fruitlessly. I'm wondering how I can determine if the PCI Express slots (I've tried two of the three) were fried despite every other part of the MOBO still working fine.

 

[cin19]

PSU started smoking and reeking of ozone

PSU replaced with spare with same wattage, 750W

Swapped HDMI cable to integrated port, video works

Purchased new GPU, 1070 TI - same problems

The problem should be from the pcie slot. Buy the new Z97 MB.

 

[spdragoo]

Well, based on your troubleshooting steps so far, I'd say it's a 50/50 shot that either the PCie slots are all fried or the GPU itself is fried. There are 2 ways to test this out:

1) Test the 1070 in a friend's working PC. If the 1070 works in the other PC, then the PCIe slots on your motherboard are fried, & you need a new board. If the 1070 doesn't work in the other PC, it's fried & you need a new GPU.

2) Test another device in the PCIe slots: another GPU (that's verified to be working), NIC, Wi-Fi adapter, etc. If the device doesn't work in the slots, the slots are fried; if the devices work just fine, your GPU is fried & needs replaced.