Snap on MT-3500 emissions analyzer, have you ever seen one working?
I have both MT-3500 and MT-3505 gas analyzer machines from mid 1990s. both only boot to courser prompt, never into home screen. Machines worked fine. Then machines were let sit for years. Now they don't boot. The rechargeable internal bios battery was dead, but now it is good and charged up. And for the last 10 years, I haven't found one of these machines that boot, they only boot up to courser. This leads me to believe that there is some sort of reset procedure that I don't know about. Any information would be helpful.