4 month old Lenovo H430 running WIN 8, Intel I3 3.4ghz w/1 PCIe 2.0 slot. Upgraded to 8GB Corsair RAM, 550W Cooler Master PS, Nvidia GForce GTX 550 Ti. GPU worked fine for 2 months until I updated to latest drivers (as of 2/20/13). After driver update and reboot I get NO VIDEO. Disconnected power to GPU, switched back to integrated VGA, reboot and it works fine. Uninstalled everything Nvidia related. Used Driver Sweeper to make sure. Reinstalled GPU. Same results. Warranted GPU. Reinstall. Same results. Called Lenovo CS and decided PCIe was bad. Warranted MB. Installed GPU on NEW MB. Same results. Entered BIOS. Set integrated VGA to default. Connected power to GPU. Boot up and integrated video works. Attempt to install GPU drivers and it fails to recognize the GPU. Removed GPU, installed neighbors AMD GPU. Same results. This is obviously a software issue since 2 different MBs are failing to recognize anything in the PCIe slot. Please advise.