White Monitor after starting MBP 13"

Hi!

Today I started my MBP and after the monitors gets white nothing else happend. After some time, about 1 minute, I shut down the MBP, and after restarting it, the MBP boots normally, so the white monitor contiued with the "watch", then booting.

After some minutes I turned off the computer,again, and then restarted it. Again, white monitor, nothing else happend. This procedure I repeated 3 times...

Can Someone help me?

Sincerely yours,

Alexander