Hi. I'm in need of some help here.

Firstly, the computer specs:

It's a old HP Pavilion h8-1120 PC. Out of warranty, of course.; this was bought in 2011.

i7-2600 @ 3.4 GHz stock
Pegatron IPSIB-CU (Carmel2) motherboard
8 GB DDR3 1333 MHz RAM
Windows 7 Home Premium
Nvidia GT530, 2GB
300W PSU

I decided to give my i7-2600 some thermal paste maintenance. Warranty's gone anyways.

That alone went fine. But me pulling out the processor from the mobo socket caused the HP PC I was working on to stop detecting discrete GPUs and revert back to the integrated GPU found inside the processor.

HP's BIOS settings are a major pain to work with, and I have yet to remedy this. I've done everything from installing the latest BIOS update, installing the integrated GPU drivers (which, oddly enough, are not present on this OEM PC) to disabling the iGPU in Device Manager (since THIS version of BIOS Utility 7 has no option to force the onboard GPU off or even force on PCI-E cards) and trying to run a display off the discrete GPU. I've even tried to swap in other GPUs, just to make sure it is a motherboard problem. None of the GPUs have been identified on this PC, and have all been able to run other other PCs. No luck so far.

Alternatives may include getting a sub-$50 mATX motherboard to replace the HP OEM mobo, or simply reinstalling Windows 7- but on the hard drive that may or may not be ending its lifespan soon, thanks to SMART.

Anyways, if you have a suggestion you'd like me to implement, let me know. Thanks!