Macintosh Plus Problems

I've had a Mac Plus for quite some time, and just got all the stuff to get it up and running. Only problem is, it won't run.

First concern is, most Mac Pluses I've seen have a gray background. Mine has a black background.

Second problem is when I put a System 6.0.4 disk into the Plus, I get a Happy Mac, some disk noise, and then nothing. It's hanging on the Happy Mac.

Third concern is I'm wondering if sitting in a garage for God knows how long will affect the performance of the machine.

FOURTH CONCERN!! When I boot the machine up and let the monitor bring up the picture, then quickly turn it off, I see some garbled gray stuff on the screen. Then when I quickly turn in on, I see white lines and the contents of the screen before turning it off moving up the screen, then disappearing. Is that normal?


Do I need to open this thing up and see what's going on? I'm scared to get shocked by the monitor, or breaking the monitor. HELP PLEASE! VERY APPRECIATED.