laptop does not work but it starts but the screen doesn't show up

[sibim4415]

My laptop Lenovo ThinkPad T400 doesn't work properly. When I switch on the laptop the light indicators work but the display doesn't show up.

 

[webworkings]

Try this...

1. Turn the laptop off (not sleep or hibernate but off).
2. Connect an external monitor to the laptop.
3. Turn on the external monitor.
4. Turn on the laptop.

NOTE: You may have to press an "external monitor" button. Could be the f4 button or a button with two monitors on it, for the external monitor to work.

If you can see fine on the external monitor, then your attached display, or the ribbon cable that connects it, are your problem.

If you can't see on the external monitor at all, or the problem occurs on the external monitor as well, then it is probably the graphics card/GPU that is the problem, which may require the motherboard be replaced.

 

[Phillip Corcoran]

ThinkPad T400 and R400 Service and Troubleshooting Guide:

https://images10.newegg.com/UploadFilesForNewegg/itemintelligence/Lenovo/44c9771_a51403852290308.pdf