X200 fails to boot up with blank screen

Hi guys, i came to the problem this morning. when i was trying to start up the computer, it failed to boot up. the machine was normally shut down last time. with no beep, the screen remains blank and black, without any change. after 2 seconds of pressing the powerkey, it is shut down with a short beep. here are what i tried:
1, use an external drive and a windows 7 disk. no reaction.
2,Remove AC and System battery. Press and hold the power button several times (3-5 time) for a count of 5 secondsReconnect AC and press the power button - if system starts normally, shut down and insert the battery. does not work.
by the way, the mahine was bought in Hongkong and still is in warranty. however, i am currently in Germany, and will stay for another 3 months.
anyone with any suggestions? thanks.
Solved!
Go to Solution.

got it fixed by clearing CMOS, wow
according to: http://forum.lenovo.com/t5/X-Series-ThinkPad-Laptops/Blank-screen-after-Bios-Upgrade-on-X200/ta-p/29...

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