Solution for: Black screen on remote windows 7 computer after logging in

Using "CTRL+ALT+END" and choosing "Start task manager" to activate the desktop.

Ruby on Rails Error: Mysql::Error: You have an error in your SQL syntax

Problem:
Mysql::Error: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 2:
        SELECT profiles.id FROM profiles
        WHERE profiles.person_id = #<Mysql::Result:0x7f53e9ca31b0>;

The rb code for this:
SELECT profiles.id FROM profiles       
WHERE profiles.person_id = #{person_id};").to_a.flatten

Solution:
SELECT 'profiles.id' FROM profiles       
  WHERE 'profiles.person_id' = '#{person_id}'").to_a.flatten

The reason for this is :
Any values which are not numeric will need to be quoted.

Ruby on Rails Error: rake aborted undefined method `generate_best_match=' for ActionDispatch::Routing:Module

Solutions:

Be sure you delete config/initializers/new_rails_defaults.rb. It is no longer necessary (per its own comments) and in fact causes a weird exception if you don’t remove it:

Ruby on Rails Error: rake db:create uninitialized constant Mysql

Solution:
 1) Add the following line to the Gemfile
gem 'mysql'

2) Rerun
bundle install