LX835 fan cycles on and off (and on and off and...) at idle since 6.20 BIOS

Hi,
I have a new-ish LX835-D3215 AIO.
The fan started to cycle on and of constantly about every 30-50 seconds (off) and 10-20 second (on) when the computer is at idle. The CPU temp is about 30% and constant and the fan runs up to 75% of max speed; both according to the PC Health monitor. It does this even when the PC is supposedly sleeping. The computer did not do this OOB, but I believe it started after the 6.20 BIOS upgrade. I have recently upgraded to Win 8 but that has not helped (nor worsened) the problem. The fan winding-up and winding down noise is really infuriating! It is much more intrusive than when the fan runs constantly during normal operation, which is at about 75% and CPU at 42% temperature.
I am disabled and I bought this computer to place by my bedside, and it has become a big disappointment. I have to power down/up or manually hibernate it. (I recently added hibernate for this purpose). I have noted a few other posts of similar fan cycling issues in the forum.
Many thanks for any help. Anyone - please!

I figured it out. Here is what you do; Shut down your mac, then unplug the power cord. Turn your Mac back on and close the lid immediately. That solved my problem.

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Thanks for the reply Lars_3.
The notebook came with Windows Home Premium pre-installed - I haven't replaced the OS at all, though I have created a recovery disk at the urging of OS when I first booted it.
The BIOS is up-to-date as I use the Toshiba Tempro service (which again was pre-installed) and occasionally check with the website to make sure I haven't missed anything. I don't like the idea of installing drivers or anything else not released by Toshiba as I've seen people mentioning overheating shutdowns (at much higher temps) from using non-f50 drivers. I regularly keep the base elevated to enhance air circulation, and clean the intakes with compressed air, but it doesn't seem to make much difference.
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About a week ago the fans on my dual 2.0 G5 running 10.4.8 started cycling on and off. After a few days of this I ran AHT and received the following error:
Error Code 2STH/1/2:CPUA AD7417 AD1.
I found out this was a possible problem with the logic board and immediately took it in to the local Apple authorised repair center. They tested it and found a Thermometer failure on CPUA AD7417. They removed both processors, reset the logic board,reinstalled the processors, and completed calibration. After which they ran ADT test and Apple G5 Service test disk twice. According to them the G5 passed all the tests and had no problems.
After I got home and set it back up the fans started cycling on and off just as they did before I took it in for repairs–they cycle on and off regardless of the ambient temperature or the amount of work the processors are performing. I ran AHT's extended test which it passed with no problems.
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Blinn–
Nope, I hadn't installed a software update. It just came out of nowhere. If you haven't done so, I reccommend running AHT to see what it shows. Hopefully you're just having a software problem.
DaddyPaycheck–
Thanks. That clears it up. I am definitely going to call Apple. I am really fuming about the lack of service I've had from the "Authorised Repair Center."
UPDATE
It just keeps getting worse. Now the G5's fans are really revving up and it is putting itself to sleep with increasing frequency. I just got off the phone with the guy who "repaired" it. The reason that AHT is showing the same error code, but on processor B is because when he reinstalled the processors after resetting the logic board he switched them. According to him, this error shows that it is a problem with processor B, which will need to be replaced. It's going to cost $581 for the CPU–no charge for labour since I've already paid to have it fixed once even though it wasn't!–but I don't think I want anyone at that shop working on it again.
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Hello and Welcome to Apple Discussions.
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LX835 fan cycles on and off (and on and off and...) at idle since 6.20 BIOS

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