Had a similar problem on my x200 when it was new, 1½ years ago. In my case, the TAB-key, located just above the keys that caused problems for you. Got the warranty replacement without any haggles, and without any request for return of the defective keyboard. So, knowing that the replacement was on i...

Would like to know what they did to your computer. Had a few similar shut-downs recently on my x200, with no blue screen, but just a small click and a very sudden black screen. Like the battery was suddenly taken out, as you describe it. This is after a motherboard replacement (for other reasons). N...

Similar problems are discussed under the subject of "Activating WWAN on x200s"
http://www.thinkpads.com/forum/viewtopi ... 43&t=84566
I posted a reply there, briefly saying that it was an excessive heat problem and was solved by exchange of the SIM-card reader.

I have experienced a "no SIM card inserted" problem for a long time, and believe I have slowly arrived at an understanding of the problem: It is a heating problem. The problem never occurs when the machine is cold. But when it has heated up for 10-15 minutes, it frequently is unable to see the SIM c...