Big lcd screen in conjunction with my laptop

I have been running LR on my laptop with a 15.4 screen.
Although it isn't state of the art dual core pc, it runs ok and I am happy with it.
I was thinking of getting a bigger laptop with a 17 inch screen, but now I'm thinking of getting a big 20 inch lcd and plugging it into my laptop.
Can anyone give me some advice on the best way to plug it in and tips on calibrating it properly. If I calibrate the new screen, will it "uncalibrate my laptop screen"?
Any other tips on using a second monitor with the laptop monitor.
Thanks.

Remove the machine from any external monitors (make sure to remove from the laptop side-sometimes people remove the cable from the monitor side-).
If docked, remove from dock.
Shut machine down, unplugg from power source and remove battery. Without replacing battery or attaching to ac power, "turn machine on" hold power button down for 10-20 seconds.
Re-install battery and power (make sure not to connect anything else). Do you see the "Thinkpad/Lenovo/IBM" splash screen? If you don't, shut the machine down and try to "shine a flashlight" into the screen...due you see a 'faint" image on the LCD?
If you do, then it could be due to several reasons in this order:
Inverter
LCD (backlight)
Motherboard.
There is a "switch" that tells the laptop when the LCD is closed or open, I had this problem on one and it turned out to be nothing more than "dust bunnies" building up on this switch...YMMV
Good luck.
Currently own: X220T, X201, X200, T61 X2, X61T X3

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