Select the Lock Screen tab, and scroll to the very end. Without an internet connection, Microsoft Spotlight can't rotate through images. My computer screen keeps turning off - signal cut. Go â¦ The issue can finally result in some other terrible problems like the black or blue screen of death, computer freezing randomly, system crash or even boot disk failure if â¦ Click it. Besides, overheating can also cause computer crashing. 'Sometimes this doesn't happen but when it does, my screen would go black for a second then 5 seconds go by and it happens again (it would repeat another 10 or more times). The mouse, num lock â¦ Faulty USB or other external devices such as the mouse and keyboard can cause the computer to freeze. You could be typing a document and touch the screen and it will go â¦ Ended up being bad RAM, and would just cause the machine to lock up randomly when performing day to day task. This happens during a range of activities, from just browsing the web to playing full-screen video. Hiding virus on the system: If the Dell laptop turns black but still running, it is likely that a virus or malware hides on your Dell device. If your CPU or GPU overheat, then also you may face the issue of computer shuts down randomly in Windows 10. If you search computer freezing randomly on the internet, you can see such complaints everywhere. I have to press Win L to lock it manually when I leave.

Windows 10 randomly goes to lock screen