Well, I guess it is my turn.
I've read through all 19 pages of this thread, and I see a lot of you are having success with the Optio S camera.
A few of us have been having this problem with the Optio S5i camera, but we all seem to have problems accessing the "secret menu" a.k.a the "technicians menu." When I press menu+flash+on the camera turns on normally and displays the a90 error. No secret menu for me!
Has anyone figured out how to get to the secret menu with the Optio s5i yet?
Thanks a million!