The ole' wife hit the turntable with a tennis ball while playing with the dog accident. Very familiar with it. You can try a couple of different things...
1) Go inside the turntable, and see if you can fix it. Often times, there is a spring or bearing underneath the button, which has come dislodge. Just a matter of getting in there and putting it back.
2) See if some electrical contact spray does the trick.
This stuff works great. and it's also available at most Radio Shack's now.
3) Just unplug it when u want to turn it off. Although, this is not really recommended, as your unit will be prone to slight surges and sparks - unless you just connect it to a power surge protector with a switch on it.
If all else fails, bring it to a service location for assistance. Shouldn't cost too much to fix, unless... the switches underneath the buttons are broken and need to be replaced. The switches are inexpensive ($5-10 part), but they'll get you on labor.
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TWEAK A/V LAB