Try external display first
Plug a monitor into the port and see if it works. If so, this about rules out the everything but the display and it's CF power inverter. If your finding is that it's in the display or related circuitry, you can order the necessary parts and repair it yourself. If you want to try the cheapest first, the CF power inverter is the easiest. You can either go to the Lenovo site and look up FRU parts by your laptop's full model number or you can open the screen and get the numbers from the parts themselves. Don't get these from Lenovo. You can do a google search for IBM replacement part suppliers. I recently fixed my wife's T42. After a local repair shop gave her an estimate of $900 or more with no guarantee, I did just what I am recommending to you. I went with the inverter (converts low voltage to high for the CF tube) and that didn't work. I then went for the screen and that fixed it. Getting these apart is a trick but, if you go to the Lenovo site, they are kind enough to provide service manuals for these laptops in Adobe format which you can download. The only problem with this is that you probably cannot return parts that you try but don't work. I got luckly and maybe you will too.
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