Hi @Marco Imperatrice  welcome to this user to user forum. This is not Dell Support. 

Interment problems are always difficult to diagnose to determine the root cause. Try Dell F12 ePSA Diagnostics test of hardware and when test complete click in right hand bottom corner to get full test results and recommendations. Then try running the all powerful system integrity check disk. As the system keeps complaining, have a look in Reliability Monitor for reoccurring warnings, click on event to get more detail. 

Please click on Kudos to say thank you for response from another user. Please share an update on progress, so that other users derive benefit from your experience. Thank you. 

Hello, I have had the same problem for about 3 weeks that the laptop occasionally reports that the GPU fan does not work in pre-boot mode. If I leave the laptop out and then call up the pre-boot mode via the boot menu, the fan works normally. Sorry for the cruel English but translated it via google translate.

Yes, it is excactly the same for me. All manual tests are ok, only the pre-boot mode gives me the problems.

Hi, thank you for your answer. I have tried the ePSA diagnostics and the check disk with no errors. After that, i've opened the Reliability Monitor and it shows me a lot of critical errors from AWCC. I think the the Command Center could be the real problem here, but I've already uninstalled it following the method described by Dell.

After that I've also checked the drivers and it seems that the AWCC has some issues with drivers. The problem is that I cannot update those drivers, he tells me that it isn't working in the right way.

Any ideas?

Ok, the care customers has just changed the fan system on my brand new R2. I've installed Command Center and it still gives me the critical errors on the Reliability page. I've uninstalled them a lot of times, updating the bios, downloaded all the possible drivers.. I don't know what to do more to solve this.

Hi @Marco Imperatrice  note that your AWCC & OC Controls versions are also used by my laptop. Our AWCC FX tab is not working and the AlienFX 2.0 applications are not installed. Want to troubleshoot this problem. Please send Private Message with copy of AlienwareAlienFXTester.exe that is located in the 'C:\Program Files\Alienware\Command Center\' folder. Thank you in anticipation. 

Hi @Marco Imperatrice thank you for sharing update.

The install AWCC update application needs more work by Dell. Please right click on yellow triangle AWCC Driver, click on Disable then Remove, then Restart laptop to save these changes. They are not required and should have been removed when AWCC was uninstalled. 

Hello, I hope this thread isn't completely dead yet... So I've been having same issue for a while, intermittent pre boot scan saying GPU fan was unresponsive. The computer always seems to run fine, no problem during usage with the fans, I  can swap the levels wit AWCC no problem and they just kick in full blast if I set on Full Speed... mystery. I've ran all the manual scans and checks too and they return no errors. Running preboot scan by manually going  to F12 also returns no errors... what is going on ??

Hello, have you found a solution to the problem?

I just do a Full Power drain on the laptop and that usually fixes the preboot error.

it used to happen on my 17 r4 a lot until I did the following steps:

hold the power button until the laptop turns off.

then unplug the Main battery from the board as well as the CMOS battery.

Then remove all the RAM sticks and hold the power button for 15 seconds.

then put the RAM back and both battery’s replugged into the laptop and leave it plugged in when turning on.