T400 Screen turns Black/Gray and System Freezes.

My screen turns black or gray and the system freezes.
The only way to fix it is to restart the system by opening all forms of power supply (adaptor and the battery).
Sometimes it works fine for a day or two, sometimes only for a few hours.
I think the problem has something do with my graphics drivers or some other driver from Lenovo.
I have used Lenovo Thinkvantage Toolbox to check for hardware errors and it shows that everything is working fine.
I have updated all drivers but still the problem is there.
I still have warrenty period left.
I bought my system 2 years ago and have never had any problem untill this one.
My system specifications are given below.
Model: Lenovo Thinkpad T400 2764 CTO
BIOS version (Latest?): 3.18 (latest)
OS loaded (ex. Win 7 64bit): Microsoft Windows 7 Ultimate 64-bit
Lenovo default OS: Microsoft Windows Vista Basic 32-bit
Updates from TVSU completed? Yes.
Updates from Windows Update? Yes.
Power Manager Version: 3.25
RAM installed (brand and 1 x 4gb, 1 x 2gb, 2 x 2gb?) 2 x 2 GB
Model of discrete card: ATI Mobility Radeon 3400
Any error notification? No
3rd party application installed for the graphic card? No.
Any particular application which is running on the time this issue arises? No.
Running on battery? AC? Docked on station? Error occurs in any state.
Any solutions?
Anyone had similar problems?
Thanks.

My problem seems to be similar. Sometimes my screen also turns black unexpectedly and the notebook freezes completely! In some cases I see a bluescreen of death and in some very few cases it restarts automatically. If it does not restart automatically I have to hold down the power button for some seconds to turn the notebook completely off (so that the "power on led" left to the "battery led" is not illuminated any more). Thereafter it is possible to start the notebook again. So unlike user 400 I do not have to remove any connected power sources.
The issue seems to occur out of nowere and seems not to be related to the use of a specific software. My system is up to date with lenovo drivers and windows update, exept the BIOS, which I updated the system two times since the problem exists since more than half a year!!
I also give my system specifications below:
Model: Lenovo Thinkpad T400 2767 WC8
BIOS version: 3.16
OS: Windows 7 Professional x64
Updates from TVSU completed? Yes. (exept newest BIOS)
Updates from Windows Update? Yes.
Power Manager Version: 3.25
RAM installed  2 x 2 GB (bought and placed by loenovo reseller)
Model of discrete card and integrated card: ATI Mobility Radeon 3400 and intel mobility 4 chip
Any error notification? yes, entry for bsod or kernel-power-issue in the system protocol (but no specific error)
3rd party application installed for the graphic card? No.
Any particular application which is running on the time this issue arises? No.
I use my notebook with AC connected, with battery and most of the time in the advanced mini dock! Since a few days the error never happened when the notebook was docked! So I thought it is a power issue or has something to do with the graphics card.
But now I found out, that the issue might be related to the wlan card! This is because I never had a wireless lan connection when the notebook was docked, since I use a LAN cable. But a few days before I had to use the wlan while my notebook was docked and the error occured after some time. Furthermore, as far as I remember the issue never occured when the wireless lan was switched off and not docked, but I will check that again.
The issue also never occured when I booted windows in safe mode.
@400
Maybe you can check if it is the same for you with your wlan? Maybe together we can find out what the exact problem is. I want to find out what is the problem to get it fixed by lenovo. Until now they alwas said, that they had never experienced such an error.
Please keep on reporting.
Thanks for any help

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