Independent video card cannot be found in windows Device Manager

The independent video card cannot be found in windows Device Manager for RT. My computer is Thinkpad R400 2784 A42, and the independent graphics card is ATI's HD3400 series. I used to change the motherboard at Lenovo thinkpad's official repair shop. When I use everst, driver genie, or driver masters for detection, my machine is identified as T400. according to the online experienced oil reflection, because the R400 sub-board and the T400 are of the same specification, they often use the T400 instead of the R400, And the T400 motherboard seems to be much better than the R400. However, this is not the key to the problem, but it was just a suspicion at the beginning. Exact Problem description: this problem occurs after I directly fail the grub boot on the linux partition disk in windows and use winPE to fix the problem successfully. In windows, the catalyst manager in the right-click menu on the desktop disappears and becomes a set display prompt. At this time, I thought it was a problem with the dedicated driver, so I completely uninstalled the dedicated driver. However, I found that after the uninstallation, I had to reinstall the driver and found that the driver could not be installed directly, the Device Manager cannot find the shadow of the independent video card, the driver master and driver genie, or the everst cannot find the shadow of the independent video card. Solution: I searched the internet for a long time .. Some netizens proposed this method and solved it successfully: Right-click the computer, choose manage, enter the Device Manager, select the system device folding item, and find the PCI bus option (or PCI bus ), right-click to uninstall the driver, and follow the prompts to press Yes until the uninstall is complete, prompting you to restart. Restart the computer, and then you will find that a large loss of system hardware is discovered and re-identified. In this case, do not change. All hardware devices are fully recognized. OK, you can find the shadow of the independent video card under the display device folding item in the Device Manager. Restart the computer and install the independent graphics card driver. Then install the driver that integrates the video card. Then restart the instance. Fortunately, we found this method to avoid reinstalling our system. In fact, there should be a problem with the PCI interface driver of beiqiao, and it will be okay to update it again. I would like to share with you that you cannot find an independent video card in the Device Manager. I hope it will help you!