Got that medion laptop out of aldi last thursday. Happy enough with it.
One issue with the screen, keep getting little glitches, best I can describe it as like little "m"s or sometimes a run of them, are appearing in random places on the screen. If I minimise the screen Im working on they disappear.
Can you get a digital camera and take a photo of it.
(I'll state the obvious that print screen won't work)
Hard to know if it hardware or software. Try a different driver, older or newer then run some graphics test on it like the free 3D mark. That will give the graphics card a workout.
aha... it does come out with a print screen. See the circled "[broken link removed]
Behaviour: The little M could be anywhere on the screen and could be a longer run of them. It might flicker while typing, will disappear if I open a new screen.