Screen brightness rapidly fluctuating and wont startup

hi guys, hope someone has seen this before and can point me in the right direction.
have set up dual boot on this system (t440s), windows 8 partition isup and running. was in the middle of installing drivers and programs for windows 7 partition, and after one of the restarts this is happening.
https://www.youtube.com/watch?v=apSB8Ci45DQ
stays like that indefinitely, wont start up.
I have tried going into safe mode and uninstalling programs one by one to find out which one caused this, but i'm running out of things to uninstall and it's still like that.

ended up fixing this with just doing a system restore, may have been the intel HD drivers i downloaded from the lenovo site, downloaded from intel site and all working ok

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