So my laptop has had a lot of problems in the past and all have been resolved, but now there is a new problem. When I switch the laptop on, the screen is so dark that it's basically black, so the screen works but not really because it goes fully black after the BIOS screen, yet it will display perfectly if I hook it up to my TV as a monitor instead of the actual laptop screen. We thought it was a loose cable but we're not too sure on that now as we have taken it apart (at least, the screen part) and everything seems to be in place fine. The laptop is a Lenovo Thinkpad X201 series model. Please help?