Just got my Sierra build up and running but I have a few things I still need help with.

Specs

OS : MacOs Serira 10.12.3

CPU :i7 6500u

GPU: Intel HD Graphics and Nvdia 980mx

Ram: 16GB DDR4

Okay so a few things

• I can't seem to get imessage to work properly, I've followed all the steps to get it working and I just can't.

  I am using a USB Wifi Adapter, using DPCIManager it is en0 but builtin is unchecked, is there any way around that?

• MY MAC FREEZES WHEN I TRY TO INSTALL REDDIT ENHANCEMENT SUITE...I've tried safari and chrome and it just freezes and reboot is the only way to fix it

• This really annoying black square flashes like every second in the top right corner of my screen

• I can't seem to connect my bluetooth mouse, it's a Microsoft Designer mouse, like it says connected but the little wheel keeps spinning then it just disconnects