Not necessarily, but you shouldn't constantly be blowing him off. If you decline an invitation, be sure to show interest by suggesting a follow-up hangout.
Every 10 to 12 minutes would be good, but instead of shaking it out, hit the joint (the part of the mouthpiece that connects to the neck) on your leg;...
I don't think it matters whether you fight Bowser before getting all the stars or not. As long as you have 120 stars when you defeat him, you'll get Luigi.
There are numerous reasons for a computer not turning on, but a hard drive is usually not one. Your computer can turn on without a hard drive. You may have...