iMac 27, the CPU temp shows 126c

Discussion in 'iMac' started by RichX, Aug 31, 2011.

  1. RichX macrumors newbie

    Aug 25, 2011

    After upgrading to Lion OS, the fan of my iMac 27 went crazy.
    I installed the iStat Pro, and it said the CPU temp was 126c (or 259f).
    I closed all tasks and the CPU was at 98-99% idle.
    I restarted the iMac and the problem remained the same.

    I never had any problem with SL for more than 7 months before upgrading to Lion.

    I bought the iMac in Jan this year.
    Should I take the iMac to the Apple store?
    Has anyone experienced the similar problem?

    Anyway, I don't think the temp read is correct.
    126c is ridiculous and the chassis is cool.

  2. iSayuSay macrumors 68040


    Feb 6, 2011
    Could be your iStat reading it wrong. Have you tried reinstalling iStat? If the back chassis (especially upper right back) is normal, you don't have to worry about anything.

    If your GPU reading is 126C .. wow that's seriously hot, could be damaged soon . But you said chassis is not that hot. A good start :)
  3. RichX thread starter macrumors newbie

    Aug 25, 2011
    I can ignore the iStat reading, but my CPU fan is at 2097 rpm, and the fan noise drive me crazy. The entire chassis is very cool.
  4. macdudesir macrumors 6502

    Jan 16, 2011
    Blacksburg, VA
    You could try an SMC reset. <----there's directions.
  5. tonyunreal macrumors regular


    Feb 25, 2010
    I say take it in for repair immediately before you burn something, 126c is far beyond abnormal.
  6. MythicFrost macrumors 68040


    Mar 11, 2009
    The computer would shut itself down if it was actually that hot as it is 26c past its maximum temperature. I believe the TJ Max for the i5 2500 / i7 2600 is 100c.

    I'd take it in anyway. The fans should be really quiet.

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