No display after changing cpu/processor

Sep 6, 2018
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I am running the following specs:
Motherboard: Asus H61M-C
Processor: Intel Pentium G2030 (Ivy Bridge) @ 3.00GHz
RAM: Kingston HyperX Fury 1600MHz 8GB Blue
GPU: Palit GeForce GTX 750 Ti StormX Dual (2GB GDDR5)
HDD: 500GB Toshiba 7200RPM
PSU: Corsair VS450
Case Fans: (2x) 120mm Rakk Ounos X White

Everything works just fine until I decided to change my cpu/processor to Intel Core i5-2500 (Sandy Bridge) @ 3.30GHz

I get a display when using onboard, while no display when plugging my VGA cable to the GPU. I can't even see the BIOS, it is simply shows no display.

I am well aware that my GPU is PCI-E 3.0 while my new processor can only support up to PCI-E 2.0. I have read that PCI-E 3.0 is backwards compatible so it must be compatible with my new processor.

I don't know if I broke my GPU just by changing the processor but I don't think so. I know the computer boots just fine but only without display.

When using onboard GPU, I can see from the software Speccy that my PCI-E 3.0 slot is my motherboard is available when it's clearly there's a video card seated there. My system is unable to detect my video card even in the device manager it does not show up.

What I have tried so far:
1. Removing the CMOS battery, pressing the power button 15 seconds, then reinstall CMOS battery.
2. Updated the BIOS to the latest available.
3. Reseating the GPU.
4. Setting the primary display to PCI-E (default is auto but my Mobo does not save the settings as when I save the settings to PCIE it always changes back to default, it seems like it does not detect a PCIE card that's why it reverts to default).
5. Uninstalling/Reinstalling graphic drivers.
6. Cleaning GPU pins with eraser.

What I will try next:
1. Putting back my old processor.
2. Try another monitor.
3. Try another VGA cable.
4. Reformat my system.
5. Try another GPU in my system (I don't have extra GPU to try it with).
6. Try the GPU in another system (I don't have another system or a friend near me to try to).


What do you guys think I can do?
 


My GPU does not need an external power as it is only 60W. It works just fine with the G2030 though.
 
MERGED QUESTION
Question from diesmilingxx : "Is the Intel Core i5-2500 (Sandy Bridge) incompatible with GTX 750 Ti (PCIE 3.0)?"







I tried that, but it always changes the primary display to default. According to this thread (http://www.tomshardware.com/answers/id-3513188/motherboard-bios-settings-changing-primary-display-pcie.html), the cause is the Mobo does not detect the GPU that's why it reverts it to default.