imac not turning on

good morning,

my imac which has all my tax work on it that I was just about to complete just died overnight. It does not come on, no sound, no fan, we get power surges here it has always been on a APC backup power and surge protector. I tried different power cord, different outlet, and all stuff in this thread. Tried the 10 seconds and release and push again as well. I disconnected all the accesories as well.

Apple iMac 27" 3.4Ghz i7/8GB/3TB Fusion/GTX 680MX 2GB GPU/OSX MD096LL/A-CTO

http://support.apple.com/kb/TS1367

Of course I do have a time capsule but after my magic mouse died I had to use a corded mouse and unplugged the external drive so my latest backup is from end July :(

I am on an island in the caribbean we have 85% humidity and it seems the on switches just go bad. This is my 3rd imac in 5 years. The other 2 have had problems with on switch as well. For the first one I took the switch apart and could sometimes get it to start with a piece of metal. We are a US territory but do not have an apple store and apple does not ship here so we are stuck with buying refurbished or used stuff off ebay.....