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That means the connecting bus(cable) from the motherboard to the screen is damaged you can check it by opening slowly the screen of ur thinkpad if display comes at some place then the bus is damaged either replace that bus or the screen might be faulty you have to get replaced your thinkpad screen in this case
Most laptops have a blue external 15pin video connector. Connect an external monitor's video cable to this port, then power up the external monitor first then boot up the ThinkPad, the video information will automatically divert to the external monitor first.
You can toggle/cycle the laptop and external monitor so they display on both the laptop and external monitor or the laptop LCD screen or external monitor by pressing the blue Fn key and then the F7 key several times.
Try to attach EXTERNAL MONITOR to check if you have display from External Display and to confirm that your Laptop System is still working. If you got display from external monitor, therefore you have a faulty LCD / Inverter (gives your LCD a back-light)
Did you say the the video output flickers on and off when you connect an external monitor to the video output.
If the inverter is faulty this would not affect the video output and the external monitor would not flicker but if the external monitor flickers it would point to a video card problem.
First, confirm that it is the screen itself. Connect the video output to a known working monitor and then power on your Thinkpad. if the known working monitor behaves the same way you can rule out the laptop's monitor as the source of the problem. This may be the BGA, Ball Grid Assembly, leadless soldering problem related to video chips on the motherboard, but first test the monitors.
When you say ?it turns on fine? I?m assuming that the power and hard drive LEDs turn on. If that is the case it could be your LCD backlight giving you problems. With the computer on and the monitor power LED green shine a flashlight in the lower left hand corner of your screen. Look for the ?Start? button, if your backlight is not working you?ll see a faint ?start? button if you look closely. This is usually an economically repairable problem but not for the typical home user. Let us know if you have any other questions and please don?t forget to rate this posting.