Win10 system black screen how to do

There are some user feedback on the Windows 10 technology preview version, booting to experience a black screen of 30 seconds to one minute, sometimes the boot time is up to 4 minutes, which is compared with most people Win10 ten seconds The situation of the boot speed is not consistent.
Workaround
It is recommended to try to turn off Quick Launch to see if the problem is getting better.
1. Right click win button, select “Power Options”
2. Click on the right side of the button to select the function of the power button, click “change the currently unavailable settings”
3 Uncheck "Allow fast start"
In addition, it is possible to use 360 ​​or computer housekeeper software to optimize the startup items, so try to restore the startup items. At present, these softwares may not be optimized for Win10. The use of Win10 may cause some inconvenience.