If the new one works then the old one is broken in

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example, if you can't get the network card working, replace it with one that you know works. If the new one works, then the old one is broken. In addition to swapping the cards, try moving the device to a different bus slot or connector. For hardware devices that include firmware, try updating the firmware to fix bugs, make new features available, or reduce security risks. o Download the firmware update from the manufacturer's website. o Before updating the firmware, back up or write down any configuration settings. o During the update, do not turn off the device. Occasionally, installing a new device will lead to system instability, crashes, BSODs, or even the inability to boot the system. If your computer has any of these problems, and if you have recently added a new device or updated a driver, try the following to get the system working again: If you can boot the system and log on, try the following: o If you had recently updated the driver, roll back the driver to a previous version. o Disable the device in Device Manager. o Physically remove the device, and then uninstall the device in Device Manager to remove the driver from the system. If you uninstall the device without removing it from the system, Windows will detect the device at the next startup and try to reinstall the driver. o Revert the system to a restore point before the device was updated or added. If the system crashes during startup before you can log on, try booting using the Last Known Good configuration. This starts Windows using the hardware configuration that existed during the last successful logon. If you install a new device, then restart the computer and log on successfully, using Last Known Good will not help resolve the problem. If the system crashes during startup, or has a problem after you log on that prevents you from taking actions to correct the problem, try booting into Safe Mode. Once in Safe Mode, disable or uninstall the device, roll back the driver, or revert to a restore point. If you cannot boot the system into Safe Mode: o Enable boot logging to record a detailed list of drivers that are loading during system startup. Examine the Ntbtlog.txt file and identify the last driver that has loaded successfully. The problem device will be after this device. o Boot the system from the installation disc and use System Restore to revert the system to a recent restore point. If you still can't start the system, try reducing the system to a minimum state by removing everything except for the CPU, one memory module, the video card, and the hard disk or optical drive for starting the operating system. Once you get the system started, add hardware devices one-by-one until you find the component that is causing the problem (you can also perform the process in reverse, removing components until the system becomes stable, then adding components back).
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