Ever since I recently updated to Monterey 12.3.6 on my iMac the last issue resolved but now it will not stay in sleep mode. I manually put it to sleep. The screen goes dark and within a second or two it wakes up. Please advise.
iMac 27″, macOS 12.6
Does it stay asleep if you do this whilst in Safe Mode?
If it does, then there is something installed that prevents your mac from sleeping.
Please run Etrecheck and post its full report here. Use the "additional text" button and paste the report into the text box.
Applications -> Utilities -> Terminal
pmset -g log
should tell you what woke up your Mac.
iMac will not stay asleep! Help please!