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Yes, they can almost always be replaced, depending on the manufacturer and model.
If you provide me with the Manufacturer and model, I can check and let you know if the replacement for yours specifically is available and where.
A password *****'t be much good if it could easily be defeated, so to start over again you'll have to do a Hard Reset.
To perform a Hard Reset: (Palm Knowledgebase article #887)http://kb.palm.com/wps/portal/kb/common/article/887_en.htmlWhile pressing and holding the Power button down, tap and release the Reset button in back and continue to hold the Power button down. When the grey Palm logo appears, you can release the Power button.You should now see the warning page in about 5 languages. Press the UP direction on the 5-way pad to complete the task. Your Palm will reset itself several times as it re-installs the original programs and erases all your previous data.