Q: half screen has vertical stripes and weird colours and mouse is also not working in that region.

Hi  adigoldi,

Thank you for using Apple Support Communities. Based on what you stated, it seems that there is a problem with one part of the screen. I would recommend you read this article, it may be able to help troubleshoot the issue. 

Get help with video issues on external displays connected to your Mac - Apple Support

Cheers