LENOVO 3000 C200 POWER ON BUT NO DISPLAY ON MONITOR
The power is on and the led indicates it is but the monitor does not come on. If you remove the panel/cover on the key pad and touch the cable that connects the monitor to the main board the monitor comes on. There is a loose cable connection. Everytime you have to open the cover and touch the cable. sometimes it works sometimes it does not. How to solve this problem permanently
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The reason may be one or more problems acting together. The problem
nowadays is that it is very difficult and time consuming to monitor and
take care of your Lenovo PC. Even experienced users find it hard to
perform such tasks on regular basis because you might need to prepare a
huge amount of time and energy to deal with each issue separately.
if the power is on and the screen does not show up , try to hook an external monitor using the VGA cable. If the screen does show up, it means that the problem is in the laptop LCD monitor itself. Otherwise if the external monitor does not show up, that means your laptop does not boot anymore to the operating system. Try to turn off the power and remove the power cable and battery on the laptop. Then press and hold the power button for 8 secs. Then reinsert the battery and power cables on the laptop then turn on the laptop. If there is still no screen displayed then call Lenovo for repair of your laptop.
try to perform battery drain. you need to take out the battery and unplugged the power adapter. press and hold the power button and count 1-10. release the power buttong after 10. do it for 3 times. after that, plug in the adapter and power adapter and observe.
download and burn "hirens bootcd" then boot from it and look for menu entries re bios, try restting it but be wary of using this very powerful suite of programs if you get it wrong you could lose everything.