Why is the screen on my iMac 2010 goes dark?

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  The image seems to reflect the possibility of problems of graphics processor.

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  https://DuckDuckGo.com/?q=imac + 24 - anomalies graphics + 2008 + in +& t = ffsb

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  availability of replacement given to nine graphics cards, if you were

  can be removed from the logic board or if it is affixed, or welded to the card.

  An iFixit.com repair guide for your series of iMac (Intel-processor 2008) 24 inches

  can show that if that article can be virtually eliminated, if if will show process.

  https://www.iFixit.com/device/iMac_Intel_24%22

  The details of the computer in the bottom of your post isn't an iMac G5 model, and

  There is no powerPC G5 processor equipped Macs after late vintage

  2005 to early 2006; If the computer in the discussion is a G5 is not 24 inches

  and would be a model of Intel. They use a different architecture than G5

  powerPC even though in some respects are similar at least in the General design.

  This contains all guide ifixit for iMac G5 Power repair (there is no 24-inch model)

  https://www.iFixit.com/device/iMac_G5

  If you have an iMac with Intel processor and an older iMac PowerPC G5, specify.

  Don't know if a reset of the SMC or likely to alter the symptoms or change NVRAM

  the Visual problem on the screen; an underlying hardware problem is a likely cause.

  • Reset the management system (SCM) controller on your Mac - Apple Support

  • How to reset the NVRAM on your Mac - Apple Support

  If this is your model iMac (24 inch Early 2008) follows the model of generation identifier:

  Introduced April 2008

  Abandoned March 2009

  IMac8, 1 model identifier

  Model number A1225

  EMC 2211

  MB325LL/A order number

  First Prize $1 799 (2.8 GHz) $2 199 (3.06 GHz)

  You may be able to find the numbers of reference and research for replacement new or repaired

  old stock graphics cards. A friend had one of these models of iMac 24 inch 2008 and

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  She even if it has been purchased by them with their extended warranty; No applecare.

  So, there are some out there in almost perfect condition, but not fixed, always.

  Do not know if the charges involved would be the value relative to the other

  later construction that can have no history of similar design construction. {Confirm the identity of the iMac.}

  Sorry I don't have any new ideas regarding this problem.

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