Regardless of temperature fans always at maximum speed

Hey,
I have a 'Refurbished 15.4-inch MacBook Pro 2.6GHz Quad-core Intel i7 with Retina Display'
It was working fine until yesterday (I've had it 11 months) when the fans decided to just stick to max spin rate (5900 odd) i tried the SMC reset. It did nothing. Reformatted the whole Macbook, even while reformatting the fans were going at maximum.. still the same problem. Did a hardware test and it just returned a SATA problem which i googled and most people said you can ignore it.
It was left off all night and when i came to use it the next day it was actually okay (Was at or around 3000) for about 30 minutes now it's just back to maximum again. Even if i have no programs open and the activity monitor shows CPU load has like 99% idle CPU the fans still run at maximum. It's okay for the most part besides the noise until it gets to a point where the whole computer slows to a crawl. Everything is delayed by like 10-15 seconds even if i have no programs open. The only way i've found to fix that is to shut it down for 5m or so, after booting it again fans still stay at maximum speed but it's usable again.
I have a genius appointment Monday but is there anything else i can try between now and then? I've just got a feeling they are gonna make me pay for any problem even though it's still in Warranty because it was dropped 4 months or so ago but the problems only started yesterday. I did actually go to Apple when it was dropped but i couldn't afford the screen replacement but i still feel like the will pin any fault on me causing it as opposed to anything else.
Thanks.

It was looked over and they said the only thing was the screen. Why would a temperature sensor be fine for 4 months after it supposodely broke?

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