Last night I tried to upgrade my Lenovo G580 laptop from Windows 8.1 to Windows 10 using the icon/reserve feature in the corner.
It completed 100%, rebooted, asked me whether to use Express Settings regarding their data collection, rebooted and presented me with a login screen.
I entered my password and clicked Enter and it gave me a black screen with a cursor. I left it for over half an hour and still nothing.
I tried pressing all key combinations. Ctrl Alt Del worked and brings up the menu, but clicking Task Manager wouldn't do anything. I was able to log out or lock the screen and could re-enter my password but still black screen. I tried plugging into external monitors and also using the Windows Key + Enter for narrator and Windows Key + P for projection settings but nothing.
I did a proper restart from the power menu, still nothing. I tried a shut down. Tried to cold boot by pressing and holding the power button, followed by a warm boot. I also tried removing the battery.
I rebooted into the advanced startup settings and tried low resolution mode, but still the same issue. Then I tried the thing about unsigned drivers. Then tried safe mode (normal), same issue. Nothing. I tried safe mode with networking, nothing. (The network side panel would show as well). I tried safe mode with command prompt and the command prompt did show.
I tried opening task manager, which did flash up the small task manager window for a second and then it vanished. Control panel won't open. None of the control panel applets. Regedit did open. "mmc" management centre did open with no snap-ins. I manually added device manager, disk management, services, and event log.
Disk management looked normal. Services seemed normal. Device manager looked okay too except a warning sign on the laptop screen (I think this is caused by safe mode). I uninstalled the drivers for webcam, bluetooth and graphics. Event log showed an error to do with a scheduled task for the browser chooser task, so I navigated in CMD and deleted this task, but on reboot still nothing.
At this point I was worried of losing my data so I went into recovery mode and clicked "Rollback to previous build" which gave me Windows 8.1 back just how I left it.
At this point I am unsure whether to attempt it again or wait. Is it possible to delete the downloaded Windows 10 and get it to re-download just in case it was corrupt or something?
My laptop is a Core i3 with Intel 4000 graphics. 8GB of RAM and a Crucial MX100 512GB SSD (replaced the original hard drive with this SSD).
I am in the UK and the laptop came with Windows 8, I got the upgrade to Windows 8.1 which went smoothly.