But why does it only happen on this PC and why not in safe mode?Yeah if you're peaking in the 90+% range on your RAM you really should add more. Windows will become very unstable and I've seen anything from not being able to log to program crashes including explorer.exe which appear as a black screen with a mouse pointer.
I found out what caused it:Hi
In safe mode many Windows elements and actions are turned off, reducing the need for memory usage.
Do you have another PC that only has 4 Gigabytes of ram, that doesn't crash?
Almost all new PCs come with 8 Gigabytes or more now.
4 Gigs isn't enough to run Windows 10 unless you aren't using it for more than the most basic activities.
And it can depend on how your other hardware is configured and what it is as well.
If you don't have a video card and are using the video from the mother board for instance you are doing all the video processing with the ram you have on the card.
Most video cards now have more than 4 Gigabytes of ram by themselves now, reducing the load on the onboard ram.
Prevention is better than cure.I found out what caused it:
Too small swap file size. The SSD of the netbook is close to full, so no place for swapping.
My netbook runs surprisignly fast on Windows 10, but if no place for swapping is available, this black screen bug happens.