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<blockquote data-quote="tiredretired" data-source="post: 1688556" data-attributes="member: 313325">Has reared its ugly head on my iMac.&nbsp; Recently I replaced the hard drive from the stock drive to a 1TB Seagate.&nbsp; OWC thermal sensor wiring adapter and OWC 4GB RAM upgrade.&nbsp; The machine runs great very fast and responsive and no more rainbow wheel of death. At the same time I installed El Capitan 10.11.1.&nbsp; Now I am noticing the dreaded Sleep wake failure which I never experienced prior to the HDD replacement and update from 10.9 Mavericks.&nbsp; I skipped using 10.10 altogether .&nbsp; A Google of this issue turns up many instances of this failure going back to 2011 or so with laptops as well as imacs without any clear fix that I have been able to discern.One cause that seems to have some traction is the use of USB external hard drives of which I am using two of.&nbsp;&nbsp; However, I was using this configuration prior to the HDD and El Capitan upgrade with no issues.&nbsp; Many are just turning off sleep mode altogether as a workaround.&nbsp; I am not totally happy with this but it is certainly a better alternative then not using external HDD.&nbsp; Also, some state that this issue does not manifest itself with a FW 800 external drive, only with USB connected HDD. Other USB connected peripherals such as printers, mouse, do not seem to cause a problem. Anyone that has experienced this over the last few years and has any input on any possible fixes or workarounds other than the two I has mentioned, if would be much appreciated.[ATTACH=full]23322[/ATTACH]</blockquote>

[QUOTE="tiredretired, post: 1688556, member: 313325"] Has reared its ugly head on my iMac. Recently I replaced the hard drive from the stock drive to a 1TB Seagate. OWC thermal sensor wiring adapter and OWC 4GB RAM upgrade. The machine runs great very fast and responsive and no more rainbow wheel of death. At the same time I installed El Capitan 10.11.1. Now I am noticing the dreaded Sleep wake failure which I never experienced prior to the HDD replacement and update from 10.9 Mavericks. I skipped using 10.10 altogether . A Google of this issue turns up many instances of this failure going back to 2011 or so with laptops as well as imacs without any clear fix that I have been able to discern. One cause that seems to have some traction is the use of USB external hard drives of which I am using two of. However, I was using this configuration prior to the HDD and El Capitan upgrade with no issues. Many are just turning off sleep mode altogether as a workaround. I am not totally happy with this but it is certainly a better alternative then not using external HDD. Also, some state that this issue does not manifest itself with a FW 800 external drive, only with USB connected HDD. Other USB connected peripherals such as printers, mouse, do not seem to cause a problem. Anyone that has experienced this over the last few years and has any input on any possible fixes or workarounds other than the two I has mentioned, if would be much appreciated. [ATTACH=full]23322[/ATTACH] [/QUOTE]

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