|If it has a dedicated battery, 1st thing I would do is get another battery, charge it up and then try the cam...2 yrs can cause some batteries to go bad.|
That's the reason I only buy cams that use double A batteries anymore for my beach and wedding photography.
'carefully opened lens and blown on em in case of dust'
You may have caused some damage there too if you didn't do it right.
Edit: Have you called Olympus support at all on this problem? I know you said it was out of warranty but they may know what the problem is.
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