Laptop computer problems can cause by internal disorders of the physical connectors. The common victims are network or modem ports, which may be detached within the case or the breaking of the power connector solder joint of the board. Such problems are very dangerous because here you need to open up the body of the notebook for soldering. Be careful to use a decent solder sucker for quick clean up.
Laptop problems are often caused by virus attacks. In this case they behave very strangely. One common symptom is the screen display goes off though the laptop is running. This can be due to graphic display driver files affected by virus or sometimes deleted by anti virus considering it to be a strange file. Re-starting the laptop in Safe Mode and re-installing the display drivers will repair this problem.
If you are not tech savvy, my personal advice is to hire a professional technician for Laptop computer repair unless it is software related problem. It is always better if you can contact s Laptop Repair Company authorized by the Laptop manufacturer.