Imac wont boot after long time without restart

Hi
I've got a two month old new Imac 21,5" with fusion drive 1TB, i had it just before mavericks was launched..
i update to mavericks. All was fine, But i allmost never shut down, or restart the imac.
After some time, I did for a reason i dont remember, had to restart the imac. while booting, it was stuck on the grey screen.. i wasn't able to get it started up, not in safe mode, not after disk repair.. i think i might have tried all the little tricks to get it running again...
luckily i did have a time machine back up...
after installing this back up, everything was fine again..
until 2 weeks later, for some reason i had to reboot again.. and again, it was stuck.. only thing to get the imac working again.. reinstall from time machine back up
after this , it tried rebooting everyday, and the imac kept working..
after a few days, i forgot to reboot for a few days.. and what did you think.. the imac is stuk again.. so while reinstalling the time machine back up. I am writing this. anyone else having this rather strange problem.. if i restart the imac now and then i keeps working.. if i dont after a few days, and i do reboot the imac.. is wont boot anymore..
Any suggestions are welcome
greetings

The long tone is an indication that a firmware update is installing. Do you get a progress bar at the bottom of you screen after letting the power button go?
Have you reset the PRAM? (cmdalt+PR when you restart the machine)
Also repair permissions when the machine is up and running.

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