T400 screen dim on startup

Hi,
When my laptop starts, the screen appears extremely dim. After the startup screen, the screen goes blank, however, windows does startup correctly as I can hear the OS welcome music. I can also hear the HD spinning and the WiFi light is also on. But all the other function lights, such as HD light, battery indicator etc. do not turn on. I have restarted the computer several times and also removed and reinstalled the battery, but the issue persists. The issue is there even if I startup without the battery. I had recently got the laptop screen, motherboard, lcd cable and hard drive replaced at a Lenovo service center, so every thing is as good as new.
I would greatly appreciate if anyone could suggest potential solutions.
Thanks.
Solved!
Go to Solution.

Hi,
I talked to the service center people and they told that they do not have any policy about 3months from date of last repair.
So, I ordered a new inverter card and installed it, but the screen is still dim on startup as before.
One additional piece of info that I didn't mention before: once the os starts up, the wireless light is the only light that is on, whereas the other lights such as battery indicator,power on etc. are all off. So I am guessing that the issue is not with the inverter card.
I read online that there is a switch somewhere near the panel that could get stuck causing the LCD panel to remain off, but I couldn't find it.
Do you think that the issue is with the motherboard itself? Should I now try replacing the LCD cable?

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