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fallen00sniper · 07-17-2007, 02:52 AM

i am also having a fan issue and nothing in bios for temps or fan speed, i have a dell latitude c840, a13 bios latest dell shows, hope this topic isn't dead, just this week i bought a replacement mainboard (used with guarentee it is 100% good) as the original had bad hdd controllers, and both fans do work, they come on a few times then stop coming on again ever i have reached 81c (speedfan), the odd thing is the fans are reported to be running (3 fans, but only are 2) with windows xp pro sp2 what appears to be a intake fan runs, ubuntu linux ultimate gamers edition the fan that appears to be exhaust runs, oddly enough ubuntu seems to run the fan whenever the cpu / acpi reaches 55c - 65c, i am confused by this and cannot figure out why only one fan will run in either OS, and why xp fails to run the fans, and i can't find this intel speedstep, did find the fix however, but have not tried flashing the bios.

please help i have spent a lot of money refurbishing this laptop for my little brother.

07-17-2007, 02:52 AM	#1 (permalink)
fallen00sniper Registered User Join Date: Jul 2007 Posts: 15 OS: win xp pro sp2	(Resolved) dell laptop fan problems i am also having a fan issue and nothing in bios for temps or fan speed, i have a dell latitude c840, a13 bios latest dell shows, hope this topic isn't dead, just this week i bought a replacement mainboard (used with guarentee it is 100% good) as the original had bad hdd controllers, and both fans do work, they come on a few times then stop coming on again ever i have reached 81c (speedfan), the odd thing is the fans are reported to be running (3 fans, but only are 2) with windows xp pro sp2 what appears to be a intake fan runs, ubuntu linux ultimate gamers edition the fan that appears to be exhaust runs, oddly enough ubuntu seems to run the fan whenever the cpu / acpi reaches 55c - 65c, i am confused by this and cannot figure out why only one fan will run in either OS, and why xp fails to run the fans, and i can't find this intel speedstep, did find the fix however, but have not tried flashing the bios. please help i have spent a lot of money refurbishing this laptop for my little brother.