Hi sntinman, welcome back
First of all, the power issue...your computer may just be going into "Hibernation" instead of turning off. A good way to test this is to disable this feature.
Right click on your Desktop, and select Properties
Screen Saver -> Power -> Hibernate ->
uncheck Enabled Hibernation.
Try shutting down your computer now to see if it works.
Secondly, it sounds like your graphics drivers are suffering. Try installing a new set, and you should see that fix itself.