screen blacks out momentarily upon starting

Hi, I appreciate if someone can help out with a minor issue on my laptop upon start-up.
My OS is Win 7 64bit. It comes from the factory with the shipment. Recently, upon starting up, during log-in session, as you are in the middle of entering your password, the screen will black out momentarily for twice in a row. It affects none of the operation as it resumes to become normal immediately. But I find this issue annoying and maybe a bigger problem in the end? So, can someone help me to rid of this issue? I truely appreciate. Thanks.

From what I can find your laptop uses an NVIDIA GeForce 310M. Drivers can be found HERE. Make sure you are using the latest.