Lenovo Flex2 (15) Logs Out On Startup

[MOLITTLE]

My Lenovo Flex2(15) dual mode intel core laptop model 20405 running Windows 8.1 is having a problem.
When I login and the Windows tiles screen is shown after about 20 seconds 3/4 of the screen on the left hand side goes black and the 1/4 on the right hand side goes white. Then the login screen is shown and after I login the same thing happens but on the third attempt it remains on and works o.k. The battery is charged and I have no idea why this happens. I have not used it much so perhaps it is sulking!! Any ideas.

[MOLITTLE]

Just to let you know I contacted tech support and they advised performing a factory reset which at the moment has resolved the issue.