How to fix Lite Brite power button from sticking

The power button on my lite brite flat screen (white one that has hand grips) 2003 keeps sticking and I can’t get the light to turn off. I can’t tell if Its the button sticking or if I just isn’t registering to shut off. I usually just hit all over the machine and I eventually get it to turn off, but I don’t know what is triggering it. Anyone have any suggestions?