I'm having this same issue. I have a DV6 laptop and just in the last few days I'm getting the 902 cooling fan error at startup. I've tried the power drain thing and blowing out the fan with air. Worked for one day, but now it won't let me do anything, back to cooling fan error. i've seen posts where a bios update helped , but not sure how to install an update if I can't get it bootup. Any ideas on how I can get it to boot so i can backup stuff before i have someone try to put a new fan in for me?
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