Hi, I have a serious problem with the laptop from a neighbour. He asked me to take a look at the pc because software was installed which he didn't want on his laptop (pcperformer). There were no blackscreen problems before I started to work with it. The laptop boots fine with its own logo. After that I get the loginscreen from Windows 8 when I swipe the screen or use the mouse. His account is the same as his hotmailaccount. That is where the problem started, I filled in the wrong password inittialy, so his account was locked. Later I received the right password and went to the windows live account on the internet and logged in succesfully with my own pc. Now whenever I try to log in again on the laptop, it takes long to login and after that I get a black screen with a mousepointer. I can use CTRL + ALT + DEL to get into the taskmanager. I can see eveything is working, I just can't get into windows. I tried Safe mode at startup (F8, Alt + F8) but no luck. There is no recoveryDVD. Specs: Medion Akoya S6212T MD99270 Intel i3 4010U, Intel HD Graphics 4400, 4GB DDR3L, Seagate 500GB SSHD Windows 8 or 8.1 preinstalled Any help is appreciated because I'm quite desperate, he needs this laptop for his work!