I have a HP67 that I have not used in many years and which my son wants to revitalize. The batteries are missing - I plan to replace them with three AA nicads, but in the meantime it has an odd problem. Whenever it is turned on, one gets a rapidly varying pattern of random digits in the display, a little like the noprmal "running" display. It won't respond to any keystrokes, however. This looks like it might be a low power failure, but I read that the 67 would operate without the batteries. Is this just a battery issue or do I have more serious problems?
Thanks in advance,
Bruce Hubbard