OK, I've got this copy of Devil World I acquired on eBay, and when I turn it on, the screen is green and splotchy, with no signs of the actual title screen until I start hammering on the Reset button. When I do get it to work, there's a loud buzzing noise while I play, and after a mere 10 minute playing session, the cartridge is hot, hot, HOT! So, my questions are:

1) What would cause this to happen, and

2) Is there a quick and easy way to crack open a FC cartridge so that I can see if everything inside is functioning?