iMac crashes during sleeep

That is NOT what I wanted to hear, if an FREE in-store diagnosis and estimate reveals a repair cost of at least USD$300 or approximately AU$350 to AU$400.

Plus I am assuming the store will not perform the needed work, I would be advised to take to an Authorised Apple Repair Store which would most likely have higher rates and the cost would be considerably higher than that repair quote.

The estimated cost of AU$350 to AU$400 is close to the remaining funds I need for a brand new iMac.

I really do not wish to spend such a considerably large sum of money on an ageing iMac especially when I so close to able to get a brand new iMac.

I am still trying other measures, I have been advised on another forum to run EtreCheckPro and see what that reveals.

My iMac is fine while its running and because of the Sleep and Start Up issues, I am now highly reluctant to switch it off, I am so scared that I will never get it started again and it will die.

I will simply have to leave my iMac permanently on and only allow the screen to turn off and hope that it lasts for a while longer as I desperately scramble to accrue the remaining funds for a new iMac.

My only other source of internet access is by my iPhone, I don't what have to depend on that for a month or two.

Update: The Apple Diagnostics Tool is still giving me the Code ADP000

Which I believe rules out hardware failure.

It's time to dig deeper and I will get the EtreCheckPro, hopefully that will give us much more information and point us in the right direction to finally fix this.

That's not possible as I'm not prepared to travel over 10 miles on public transport with a quite heavy iMac and risk it being stolen.

I would then have to walk across an entire city to get to my nearest Apple Retail Store, whom would not perform the repair work. The iMac is a quite heavy device when you have to picket up and carry manually.

I would be told to find an Authorised Apple Repairer.

I prefer not to spend over AU$400 or more on an ageing 7 year old iMac.

Hi,

Please Note, the results of the Terminal Command you advised to run are obtained from my iMac which has its entire HD erased and a fresh copy of macOS Ventura 13.6.6 installed.

I checked or updates and there was only an update for Safari, which I allowed to be installed.

Apart from the update to Safari, Absolutely ZERO changes have been made to my iMacs configuration, my iMac is in a "Virginal" state.

I run the Terminal Command you advised me to perform with my iMac in this untouched "Virginal" state.

Here is the report:

Last login: Thu Apr 18 18:14:44 on console

jim@iMac ~ % pmset -g

System-wide power settings:

Currently in use:

 Sleep On Power Button 1

 autopoweroff         1

 standbydelayhigh     86400

 autopoweroffdelay    259200

 standbydelaylow      86400

 standby              1

 proximitywake        1

 ttyskeepawake        1

 hibernatemode        0

 powernap             1

 gpuswitch            2

 hibernatefile        /var/vm/sleepimage

 highstandbythreshold 50

 womp                 1

 displaysleep         10

 networkoversleep     0

 sleep                1 (sleep prevented by bluetoothd, sharingd)

 tcpkeepalive         1

 halfdim              1

 autorestart          0

 disksleep            10

jim@iMac ~ % 

Please note nothing has fixed my problems with my iMac crashing during sleep or the start up issues which involve multiple attempts to get it to finally start.

Everything was completely erased and clean install was done via a bootable USB installer drive.

Currently NOTHING has been altered except for an update to Safari.

The problems are still persisting despite my iMac being restored to a "Virginal" unaltered configuration.

I have tried your advice previously and it didn't help.

The EtreCheckPro results indicate a problem with the graphics, I have researched this on the internet and it is true that a failing graphics video card can cause all the problems I am experiencing.

However I'm awaiting further information from other posters whom looked at my EtreCheckPro results and are advising me. This software seems to have detected a problem missed by the Apple Diagnostics Tool.

I prefer to follow this line of investigation and see where it leads me.

How do I adjust the autopoweroffdelay setting and set hibernatemode to 3.

I am willing to try any workaround to keep this iMac alive a little longer, I'm not willing to spend over AU$400 on an ageing 7 year old iMac when I am so close to being able to afford a new one.

Apple stubbornly refuses to accept PayPal "Pay in 4" on hardware which would increase their sales of entry level iMacs.

I have tried all the advice given without success.

I know that my problems with my iMac only seem to occur during Sleep and Starting up.

A temporary solution which is working effectively is using the free Amphetamine app from the Apple App Store, it is configured to stop my iMac from sleeping indefinitely. I allow the iMac display to sleep after 5 minutes to reduce power consumption without any issues, but if needed Amphetamine can stop the display sleeping indefinitely.

I have also obtained phone quotes from at least 6 authorized Apple Repair Agents about the cost of replacing a failing video card. The minimum cost quoted was over AUD$600, that is an amount I am not prepared to spend on an ageing 7 year old iMac.

I pleaded my case to a few family members and a kind hearted relative is willing to loan me the remaining amount needed to cover the amount I need to get a new iMac, they know I am trustworthy and will soon get their money back.

They will be visiting next Wednesday and I will be able to order a new iMac when I see them, a day or so later all this stress will be behind me.