Question GPU causes long POST + code 43


Jun 29, 2016
Some time ago I built a computer for daily use and some light gaming. It was all fun and games until a thunderstorm. I forgot to disconnect power supply and my motherboard died. I replaced it with a new one. Everything was working perfectly upon some time ago when my GPU started to stop working correctly while using computer. A restart would usually fix it but now it seems like it has permanently stopped working.
When I turn on my computer, POST phase takes like 20 seconds (when everything was fine, it was about 2 seconds). But it passes. When I get into Windows, it shows Code 43 on my GPU and my resolution is low. Also there are small blue squares displayed on darker areas of the screen. I am certain that GPU causes all these problems because I put it in different, perfectly working system and same problems. I've tried reinstalling drivers, checked all connections, checked if GPU is seated properly, replaced CMOS battery and so on. I am on the verge of just throwing the damn thing into a oven. I also doubt If Windows has anything to do with this because of the long POST times. What can I do?

My specs:
MB: Asrock G41M-VS3 R2.0
CPU: Intel Core 2 Quad Q9400
GPU: Nvidia Geforce GTX 750 Ti (device manager detects that it is a GTX 750 Ti. It doesn't just show unknown device)
RAM: Dual Channel 8GB 1333 MHz
Error code 43 is a generic message that typically indicates a problem with the hardware or software in Windows operating system. This error is often reported in Windows Device Manager. If you encounter this error with your graphics card, here are some troubleshooting ideas that may help fix it.

1) Update your graphics card driver.

2) Make sure your system is updated with the latest SBIOS and Windows updates

3) Check to make sure your system power supply meets the minimum recommended power requirement for your card

4) If your card needs additional power, make sure the PCIe supplemental power connector is plugged into the card

5) Replace the graphics card as it may be defective...

Code 43 can mostly happens either if drivers fail or the hardware fails. Other option is that your GPU or motherboard slot failed. If your motherboard has more then one PCIe x16 slot, you can move GPU to another slot to rule out motherboard failure. Or you should test GPU in another machine to confirm that problem lies in the card.

Your GPU might be faulty, but before we jump on any conclusion, can you TEST the Video card on some other PC ? Also, are you on a FRESH Windows OS install ? IF not, then try doing a clean format of your SSD/HDD, if need be. Can you install the GPU drivers ?

Clear and reset ALL the CMOS/BIOS settings to default.

The above Error code 43 can be reported anytime when Windows does not recognize a device – whether it's a USB port, Hard drive, video card/GPU, or any other piece of hardware connected to the computer. Most of the time, error code 43 means that a device driver is either missing, corrupt, and/or outdated (so Windows has problems communicating properly with the hardware), or the hardware is faulty and needs to be replaced.

This error code points out that the Hardware might also be defective, which is the GPU. But before we jump to any conclusion, check the card on some other PC as well.