Dear all,

the fan problem was a mistake on my part. I unbolted the metal protection in the intake to see if I could fit a 3D printed part. When I bolted it on again, I put it in the reverse direction and it was blocking one fan blade. I bolted it the proper way and now everything is fine.

So, the solve the "No data in Miner Status page", what I did was to install an older version of the firmware, specifically, Antminer-S9-all-201704270135-autofreq-user-Update2UBI-NF.tar.gz, which is bitmain's suggestion to replace Antminer-S9-all-201704280713-autofreq-user-Update2UBI-NF.tar, the file proposed by fanatic26. I also changed my ethernet cable as porposed by Sandal_Hat.

Thank you very much fanatic26! Thank you very much Sandal_Hat! I would also like to thank all the users that shared their advice with me in this thread:
BitMaxz
Seven_Little_Guys
jafolkerts
fanatic26
jafolkerts
je_mario
KWMiner
LENIN12345
Sandal_Hat

Best regards,
Paulo