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If your mac is completely locked up and only if it doesn't respond to any keyboard commands, then as a last resort, hold down the power button until the computer powers down.
Now, turn the Mac back on by pressing the power button. After you hear the startup chime, hold down the mouse button. This will tell the computer to eject the disc from the CDs drive. The computer should then start up normally.
Please write back if this suggestion worked. Good luck.
There are no capacitors or anything
that can hold a charge on the cart itself. The only thing that we've
been able to come up with thus far is that dry air in the schools may
help generating static electricity. Common precautions would be 1. make
sure the ground plug is still on the cord. (This can get broken off if
the cart is moved with the cord still plugged into the wall.) Plugging
the ground cord in won't help however if the person has to grab the door
handle to open the door to get to the wall outlet. 2. If the air is dry
(ie: people get shocks even without the cart or the problem goes away
in the spring when the humidity goes up), gently push the metal of the
cart handle against the door frame prior to reaching for the door
handle. This will discharge any static electricity that was built up as
the person walked with the cart safely to the door jamb prior to the
person reaching for the door handle.
Shut down the computer (complete power off, not restart) Hold down the left button (Apple mouse?) Push the power button Keep holding the mouse button down until it either ejects or the grey pinwheel appears. (It's not an instant process)
Usually, eject/F12 will open the drive up. If that does not work try. Open terminal and use the command "drutil tray eject"
You can also try command-option O + F and type"eject cd"If none of this works your drive may be bad or the power cord is loose. You will need to open it up or seek professional service.