Sometimes it is necessary to perform a MEMORY LOST (turn OFF, hold BACKARROW, turn ON). Use fresh batteries and unplug any peripherals to verify they are not the problem.
Frequently it can be fixed by turning it off and briefly removing the battery pack to interrupt the power. Unless it has been recently dropped, there may be nothing physically wrong with it. Sometimes a perfectly good HP-41 will "go crazy" for no apparent reason or "lock up" and refuse to even turn on. My calculator suddenly stopped working, what do I do? At this time, my efforts are limited to providing documents through this website. There are also several people who ocassionally develop new software and hardware for the HP-41. Many of these people are active with newer models of HP calculators. However, a number of active HP-41 collectors and experts may be found on forums () and auction sites.
At one time, there were dedicated HP-41 user's groups, mailing lists, newsletters, etc. The HP-41 is obsolete and Hewlett-Packard does not support it anymore. Repair and Support Who should I contact for any HP-41 support issues?
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