New Life Games Tech Forums

I just purchased an old cherry master and though I've played them for years I had never owned one. The problem is the monitor is clear, but the screen is blue in the background and the play area has a greenish look. I tried adjusting the color drives and for a little while the background became black and the play area was somewhat white,but this didn't last long. Can anyone help me on this problem? p.s. The only thing I can find on the machine is that it is a ED-95 and has a ex. bonus for fruit up to 5000.