Fujitsu li 2727 black screen on starting, power light on but wont display anything. tried hard reset and taken accesible hardware out and back in but still nothing.

Most laptops have a backlit display panel, usually a black screen means that the rear illumination has either failed or the switch which places the laptop into sleep mode when you close the lid has failed or jammed. Most sleep switches can be seen around the spine or hinges of the display panel and gentle coaxing with a wooden toothpick can usually release them but DO NOT use a probe made of metal as this could cause catastrophic damage if it touches and of the internal circuitry.
If you find that the sleep switch is working, take the laptop to a qualified repairer as laptops are really bad to disassemble and the display is NOT a repairable item. The inverter for the backlights is usually contained within the trim surrounding the display panel but may sometimes be hidden inside the base of the unit. THIS INVERTER OPERATES AT HIGH VOLTAGES. NEVER TOUCH IT OR ATTEMPT ANY KIND OF REPAIR WHILST THE INVERTER IS CONNECTED TO THE POWER SUPPLY - YOU HAVE BEEN WARNED.