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I'm usually the one doing the tech support, not looking for it. This is weird. I am experiencing defiant child syndrome and I don't even have a child. I put my desktop into sleep mode when I go to work so I can send a wake on LAN packet and remote into it if I need a way to test things from outside our internal network or retrieve some file. Windows 7 Pro 64-bit Asus Z170-P D3 Motherboard i5-6600k CPU Machine has just been gutted by PSU failure, so it had a new PSU, motherboard, and processor installed on Monday. Through early Tuesday sleep mode worked fine, but after installing all the hundreds of Windows updates, various bits of software on my fresh Windows install, and overclocking the CPU something went wrong and as of very late Tuesday sleep mode ceased to function properly. The computer will go to sleep and then wake back up within seconds. Hands are entirely off the desk, no movement of the keyboard/mouse. Event viewer does not help, it simply lists the source as "unknown". An elevated command line query of "powercfg -lastwake" returns no useful information, it doesn't even bother listing a device category that caused the last wake. An elevated command line query of "powercfg devicequery wake_armed" returned four devices as able to wake the computer, the network card and three "HID Keyboard Device <00X>". Things I have tried Disabling wake timers in power configurationpowercfg devicedisablewake [all devices]GUI disabling of a device's ability to wake the computerHibernate mode instead of sleep mode (same results, just takes longer to start back up again) I haven't tried physically unplugging the keyboard/mouse/Ethernet cable, that's on my list when I get back from work. As a last resort I can do a system restore to Tuesday morning but don't particularly fancy installing 200+ Windows updates and various pieces of software again, particularly if doing so will just cause the issue to arise once more. All the Google searching I've done only covers finding the device that last woke the computer via the event viewer and then disabling that. Unfortunately, I don't get that information and even after disabling all devices it still happens, and I'm out of ideas.