Someone who owns a very well SEO company came to me with a freshly installed Windows 10 OS on a Lenovo T400 and showed me that he would get a black screen at start up. He would suspend the machine (close the lid), and it would come back to normal. He would reboot, and the same problem would reproduce again.
This didn’t happen when he first installed the OS. Only happened after the OS was installed and Windows update was run. I was suspicious that it might be a driver issue, but Lenovo’s website didn’t show much.
Then looked into the device manager and saw this:
What’s interesting here is that the laptop actually has 2 video cards. I think it’s for power savings. I took a gamble and disabled the Intel video card. The problem went away!
Update: Booted into the BIOS and under video settings, found that the Lenovo could install a Switchable graphics driver along with their power management software so that it could save power. So, my hunch was correct. So, no need to disable the Intel card. Just boot into the BIOS and set it to discrete or the other one, whatever it is. I just set mine to discrete.