Thinkpad will not turn on.

Registration date
Sunday April 24, 2016
Last seen
April 24, 2016
Hi all,
I am having a major problem with my work laptop. I have to work today all day in order to prepare for tomorrow, and all of a sudden my Lenovo Thinkpad T450S does not turn on anymore.
The lights (capslock, Fn and mute) on the keyboard are lit, but nothing happens when I press the power button.
I have been reading on the internet about holding the power button for 60 minutes and disconnecting the battery, but this does not help. Also the other 'trick' where you press the power button 10x 1sec and then 30secs does not work.
Are there any geniuses out there who know how to fix this one?
Would be a life saver!
Thanks in advance