First of all, you're root right? (my first guess microsd-related-problem)
Have you got a spare microsd (one that you absolutely sure it's working and is not the one you're using in your phone)?
Did anyone open the phone?(psysically). From what it looks it might be a H/W issue (if you did all the appropriate software approach)
P.S. H/W meaning ram issue, also how old is the phone?
----chrisb906 you have disabled pm's?why?-----