HP 48GX, weird on key behavior -- only works when simultaneously pressing a white key

Hi all,
I have an hp48gx calculator that I love, but, the "on" button no longer gets recognized as being pressed unless one of the top row buttons is pressed at the same time (e.g., the white "C").
example: to turn off, I need to do rshift, then hold on and press "C". expected behavior: rshift, on should turn the calculator off.
example: to turn up contrast, I have to hold C-On and press . expected: on and press plus
Any thoughts?
Thanks
Jonathan

Try a warmstart, that is hold down the ON key, press and release C, release ON.
If that doesn't work, try doing a restart with a paper-clip reset. Remove the upper right (as viewed from the back) rubber foot. You'll see a small hole with the letter R next to it. Gently insert a straightened paper-clip (or something similar) straight in as far as it will go, and release it.
If the above doesn't solve it, the problem may be more serious:
Try pressing on the bezel, between the display and the soft keys, while you press a key.
The problem then is that the rubber support inside tends to deteriorate.
Here is a thread that discusses the problem:
http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/archv019.cgi?read=151696
If you have a wish to try to repair it:
here is a guide to opening:
http://users.ju.edu/hduong/open/
and for repairing:
http://users.ju.edu/hduong/repair/
(about halfway down see "keyboard connector" and "Rubber Under Keyboard Contacts" which is the bit that has to be replaced).
(Note: the SX shown in the links above is physically the same as the GX)
Someone's temporary fix without opening the calculator:
http://h30499.www3.hp.com/hpeb/attachments/hpeb/bsc-408/13673/1/HP42S.jpg
Note: I do not work for HP, I just like playing with calculators :-)

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HP 48GX, weird on key behavior -- only works when simultaneously pressing a white key

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