Not so much a problem with a Medion laptop, but a Medion Monitor and the 3 year warranty.
Had another make monitor that was causing sudden problems, so a quick trip to Staples to get another monitor. Decided on a Medion, and was informed that the unused display only model was the last in stock, so decided to take that. Noticing that the instruction booklet was missing,and Staples could not find it. I thought on returning home that I would contact Medion to register the 3 year warranty and request a copy of the instruction book, if available.
Registered the monitor and paid a fee for a copy of the instructions. I explained at the time that it might have been Staples who had lost the booklet, as they had the monitor on show for sales purposes. A day or so later, Medion contacted me to state that the monitor warranty was void, "because the monitor was second user or second-hand, and as such no warranty". Long story,that took unnecessary work on my part, but eventually Staples offered to honour the full warranty.
I must add though, that I have owned other Medion devices, and all have served me very well.
Plus I believe since the time I was talking about, Medion might have changed ownership or done changes to their UK division (could be wrong though?)so I would suggest that you recheck the communication details for Medion?.